[FIX] Remove reference to session storage (hedyorg#4331)

This code dates from 3 years ago, was a first attempt at code persistence, and isn't very useful anymore. Let's get rid of it.

Fixes hedyorg#4330.

![this is fine](https://i.kym-cdn.com/entries/icons/facebook/000/018/012/this_is_fine.jpg)

**How to test**

Everything works exactly the same (but with less confusion reviewing).

static/js/app.ts

@@ -274,41 +274,24 @@ function initializeMainEditor($editor: JQuery) {
 
   window.Range = ace.require('ace/range').Range // get reference to ace/range
 
-  // Load existing code from session, if it exists
-  const storage = window.sessionStorage;
-  if (storage) {
-    const loadedProgram = $editor.data('loaded-program');
-
-    // On page load, if we have a saved program and we are not loading a program by id, we load the saved program
-    const programFromStorage = storage.getItem(currentTabLsKey());
-    if (loadedProgram !== 'True' && programFromStorage) {
-      editor.setValue(programFromStorage?.trim(), MOVE_CURSOR_TO_END);
-    }
-
-    // When the user exits the editor, save what we have.
-    editor.on('blur', function(_e: Event) {
-      storage.setItem(currentTabLsKey(), editor.getValue());
-    });
+  if (dir === "rtl") {
+      editor.setOptions({ rtl: true });
+  }
 
-    if (dir === "rtl") {
-        editor.setOptions({ rtl: true });
+  // If prompt is shown and user enters text in the editor, hide the prompt.
+  editor.on('change', function () {
+    if (askPromptOpen) {
+      stopit();
+      editor.focus(); // Make sure the editor has focus, so we can continue typing
     }
+    if ($('#ask-modal').is(':visible')) $('#inline-modal').hide();
+    askPromptOpen = false;
+    $ ('#runit').css('background-color', '');
 
-    // If prompt is shown and user enters text in the editor, hide the prompt.
-    editor.on('change', function () {
-      if (askPromptOpen) {
-        stopit();
-        editor.focus(); // Make sure the editor has focus, so we can continue typing
-      }
-      if ($('#ask-modal').is(':visible')) $('#inline-modal').hide();
-      askPromptOpen = false;
-      $ ('#runit').css('background-color', '');
-
-      clearErrors(editor);
-      //removing the debugging state when loading in the editor
-      stopDebug();
-    });
-  }
+    clearErrors(editor);
+    //removing the debugging state when loading in the editor
+    stopDebug();
+  });
 
   // *** KEYBOARD SHORTCUTS ***
 
@@ -1533,29 +1516,6 @@ function initializeModalEditor($editor: JQuery) {
 
   window.Range = ace.require('ace/range').Range // get reference to ace/range
 
-  // Load existing code from session, if it exists
-  const storage = window.sessionStorage;
-  if (storage) {
-      let tempIndex = 0;
-      let resultString = "";
-
-      if(storage.getItem('fixed_{lvl}'.replace("{lvl}", currentTabLsKey()))){
-        resultString = storage.getItem('fixed_{lvl}'.replace("{lvl}", currentTabLsKey()))?? "";
-        let tempString = ""
-        for (let i = 0; i < resultString.length + 1; i++) {
-          setTimeout(function() {
-            editor.setValue(tempString,tempIndex);
-            tempString += resultString[tempIndex];
-            tempIndex++;
-          }, 150 * i);
-        }
-      }
-      else{
-        resultString = storage.getItem('warning_{lvl}'.replace("{lvl}", currentTabLsKey()))?? "";
-        editor.setValue(resultString);
-      }
-  }
-
   // *** KEYBOARD SHORTCUTS ***
 
   let altPressed: boolean | undefined;