Guard the key_is_pressed/key_was_pressed arguments better

Instead of using the argument as-is, which could be misinterpreted as a
reference (at least by linkers), wrap them in parens to make it clear they are
not.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/keyswitch_state.h

@@ -7,7 +7,7 @@
 #define IS_PRESSED  B00000010
 #define WAS_PRESSED B00000001
 
-#define key_was_pressed(keyState) (keyState & WAS_PRESSED)
-#define key_is_pressed(keyState)  (keyState & IS_PRESSED)
+#define key_was_pressed(keyState) ((keyState) & WAS_PRESSED)
+#define key_is_pressed(keyState)  ((keyState) & IS_PRESSED)
 #define key_toggled_on(keyState)  (key_is_pressed(keyState) && ! key_was_pressed(keyState))
 #define key_toggled_off(keyState) (key_was_pressed(keyState) && ! key_is_pressed(keyState))