FIX: navigate to topic/PM regardless of Shift key press (#15551)

Currently when pressing Shift key and hitting Reply button the user
stays on the post they are on and does not get navigated to newly
created topic/PM/reply. This is fine for replies but creates confusion
when composing a new topic/PM.

This commits makes it such that pressing Shift key and Reply button
(or ctrl-shift-enter / cmd-shift-enter) works only for replies and not
for new topic/PM. The user will always be navigated to new topic/PM.

app/assets/javascripts/discourse/app/controllers/composer.js

@@ -632,7 +632,9 @@ export default Controller.extend({
 
     save(ignore, event) {
       this.save(false, {
-        jump: !event?.shiftKey && !this.skipJumpOnSave,
+        jump:
+          !(event?.shiftKey && this.get("model.replyingToTopic")) &&
+          !this.skipJumpOnSave,
       });
     },