patch 8.2.2111: GTK: menu background is the same color as the main window

Problem:    GTK: Menu background is the same color as the main window.
Solution:   Fix white space around the test in another way. (closes #7437,
            closes #7427)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2111,
 /**/
     2110,
 /**/