Put space before image (#1735)

app/assets/javascripts/components/reducers/compose.jsx

@@ -77,8 +77,8 @@ function appendMedia(state, media) {
     map.update('media_attachments', list => list.push(media));
     map.set('is_uploading', false);
     map.set('resetFileKey', Math.floor((Math.random() * 0x10000)));
+    map.update('text', oldText => `${oldText.trim()} ${media.get('text_url')}`);
     map.set('focusDate', new Date());
-    map.update('text', oldText => `${oldText.trim()} ${media.get('text_url')}`.trim() + ' ');
   });
 };