revert: bot.unregister and bot.unregister_jobs

sopel/bot.py

@@ -409,6 +409,9 @@ def unregister(self, obj):
         """
         callable_name = getattr(obj, "__name__", 'UNKNOWN')
 
+        if hasattr(obj, 'interval'):
+            self.unregister_jobs([obj])
+
         if callable_name == "shutdown" and obj in self.shutdown_methods:
             self.unregister_shutdowns([obj])
 
@@ -496,6 +499,10 @@ def register_jobs(self, jobs):
             job = sopel.tools.jobs.Job.from_callable(self.settings, func)
             self._scheduler.register(job)
 
+    def unregister_jobs(self, jobs):
+        for job in jobs:
+            self._scheduler.remove_callable_job(job)
+
     def register_shutdowns(self, shutdowns):
         # Append plugin's shutdown function to the bot's list of functions to
         # call on shutdown