fix(lists): Fix alignment of secondary icons/controls.

Icons and controls (like checkbox and switch) were incorrectly
positioned. Fix by ensuring that they are all right-aligned.

Fixes angular#3699. Closes angular#5533.

src/components/list/list.scss

@@ -135,11 +135,18 @@ md-list-item, md-list-item .md-list-item-inner {
 
   md-checkbox.md-secondary,
   md-switch.md-secondary {
-    margin-right: 0;
     margin-top: 0;
     margin-bottom: 0;
   }
 
+  md-checkbox.md-secondary {
+    margin-right: 0;
+  }
+
+  md-switch.md-secondary {
+    margin-right: -6px;
+  }
+
   button.md-button.md-secondary-container {
     background-color: transparent;
     align-self: center;
@@ -150,6 +157,11 @@ md-list-item, md-list-item .md-list-item-inner {
     .md-ripple-container {
       border-radius: 50%;
     }
+
+    &.md-icon-button {
+      // Make icon buttons align with checkboxes and other controls
+      margin-right: -12px;
+    }
   }
 
   .md-secondary-container,