Held + normal key should prevent oneshot from firing

When holding a one-shot key and tapping another that would cancel the one-shot
effect, when we release the one-shot key within `hold_time_out`, do not start
the oneshot effect.

This is done by only clearing the `should_cancel_` flag in `loopHook` when
cancellation did happen. If we clear anyway, then the flag set by the
interrupting keypress will be lost by the time we release the one-shot key.

Reported by @ToyKeeper, thanks a lot for the detailed explanation!

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

src/Kaleidoscope/OneShot.cpp

@@ -170,19 +170,23 @@ void OneShot::loopHook(bool is_post_clear) {
     if (hasTimedOut())
       cancel();
 
+    bool is_cancelled = false;
+
     for (uint8_t i = 0; i < 32; i++) {
       if (should_cancel_) {
         if (isSticky(i)) {
           if (should_cancel_stickies_) {
+            is_cancelled = true;
             clearSticky(i);
           }
         } else if (isOneShot(i) && !isPressed(i)) {
+          is_cancelled = true;
           cancelOneShot(i);
         }
       }
     }
 
-    if (should_cancel_) {
+    if (is_cancelled) {
       should_cancel_ = false;
       should_cancel_stickies_ = false;
     }