Remove redundant test for $DISPLAY

This block is already wrapped in the `else` block of the same test for
the `$DISPLAY` variable, so this test is redundant.

tomb

@@ -390,7 +390,6 @@ EOF`
         if _is_found "pinentry-gtk-2"; then
 
             gtkrc=""
-            [[ "$DISPLAY" = "" ]] || {
             theme=/share/themes/tomb/gtk-2.0-key/gtkrc
             for i in /usr/local /usr; do
                 [[ -r $i/$theme ]] && {
@@ -398,7 +397,6 @@ EOF`
                     break
                 }
             done
-            }
             [[ "$gtkrc" = "" ]] || {
                 gtkrc_old="$GTK2_RC_FILES"
                 export GTK2_RC_FILES="$gtkrc"