notes: hide note bodies while keyboard moving notes.

Bug: if you used they keyboard to move or resize a note, then the note
body would stay visible, which could get in the way when moving in the
down direction.

app/javascript/src/javascripts/notes.js

@@ -217,6 +217,7 @@ class Note {
         left: position.percent_left,
       });
 
+      Note.Body.hide_all();
       $note_box.addClass("unsaved");
       event.preventDefault();
     }
@@ -254,6 +255,7 @@ class Note {
         });
       }
 
+      Note.Body.hide_all();
       $note_box.addClass("unsaved");
       event.preventDefault();
     }