config: Remove whitespace

Author: xemle

gallery.config-example.yml

@@ -58,9 +58,9 @@ sources:
     # Offline sources require an index file. Previews and meta data
     # should be extracted first before marking a source offline
     #offline: false
-    # Allows the original files to be downloaded via de webapp.  
-    # This adds a link to images of this source in the details view.  
-    # Sources set as `offline` won't be made available.  
+    # Allows the original files to be downloaded via de webapp.
+    # This adds a link to images of this source in the details view.
+    # Sources set as `offline` won't be made available.
     #downloadable: true
     # Filename matcher for checksum recalculation
     # size-ctime-inode: this matcher should be used if possible, might