switch back to whitelisting modifers (#150)

* Revert "Allow any set of modifiers to be used in keybindings"

this keeps things equal with sxiv while giving users possibility to
customize USED_MODMASK if they wish.

This reverts commit 3234b0e521cca006a94cb135a88d146122d7f66d.

Closes: https://github.com/nsxiv/nsxiv/issues/149
Closes: https://github.com/nsxiv/nsxiv/issues/123

Co-authored-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index 85d498d..5bcc90e 100644
--- a/main.c
+++ b/main.c
@@ -36,7 +36,7 @@
 #include <X11/keysym.h>
 #include <X11/XF86keysym.h>
 
-#define MODMASK(mask) ((mask) & ~ignore_mask)
+#define MODMASK(mask) ((mask) & USED_MODMASK)
 #define BAR_SEP "  "
 
 typedef struct {