bindings: do not show the Full-Justify keystroke when in View mode

The file may not be modified when in View mode, so it makes no sense
to prominently show the M-J keystroke in the Search menu when in that
mode, especially since the keystroke does not really belong there.

This addresses https://savannah.gnu.org/bugs/?57574.

src/global.c

@@ -1255,7 +1255,8 @@ void shortcut_init(void)
 	add_to_sclist(MMAIN, "M-D", 0, do_wordlinechar_count, 0);
 #endif
 #ifdef ENABLE_JUSTIFY
-	add_to_sclist(MMAIN|MWHEREIS, "M-J", 0, do_full_justify, 0);
+	if (!ISSET(VIEW_MODE))
+		add_to_sclist(MMAIN|MWHEREIS, "M-J", 0, do_full_justify, 0);
 #endif
 	if (!ISSET(PRESERVE))
 		add_to_sclist(MMAIN|MHELP|MBROWSER, "^L", 0, total_refresh, 0);