keyboard: Fix typo

src/events/SDL_keyboard.c

@@ -30,10 +30,10 @@
 
 /* Global keyboard information */
 
-#define KEYBOARD_HARDWARE   0x01
-#define KEYBOARD_VIRTUAL    0x02
-#define KEYBOARD_AUTORELEASE    0x04
-#define KEYBOARD_IGNOREMODIFIERS    0x0
+#define KEYBOARD_HARDWARE        0x01
+#define KEYBOARD_VIRTUAL         0x02
+#define KEYBOARD_AUTORELEASE     0x04
+#define KEYBOARD_IGNOREMODIFIERS 0x08
 
 #define KEYBOARD_SOURCE_MASK (KEYBOARD_HARDWARE | KEYBOARD_AUTORELEASE)