notes: hide note bodies when toggling notes.

Bug: if you clicked preview on a note to show the note body, then clicked
the image to hide the notes, then the note body wouldn't be hidden.

app/javascript/src/javascripts/notes.js

@@ -370,6 +370,7 @@ class Note {
     }
 
     static toggle_all() {
+      Note.Body.hide_all();
       $(".note-container").toggleClass("hide-notes");
     }
   }