notes: hide note bodies when resizing image.

Bug: if you're editing a note and click preview, then you resize the
image or press V to toggle the image size, then the note body will stay
on the screen in the wrong position.

app/javascript/src/javascripts/notes.js

@@ -362,6 +362,8 @@ class Note {
         return;
       }
 
+      Note.Body.hide_all();
+
       let large_width = parseFloat($image.data('large-width'));
       let ratio = $image.width() / large_width;
       let font_percentage = ratio * 100;