Clear crash flip mode flag on disarming (#5566)

Previously the flag was only set during arming so after crash flip mode was used the flag would stay active until the next arming. This caused the "CRASH FLIP" warning message to erroneously display on the OSD when disarmed.

src/main/fc/fc_core.c

@@ -180,6 +180,9 @@ void updateArmingStatus(void)
             unsetArmingDisabled(ARMING_DISABLED_BOOT_GRACE_TIME);
         }
 
+        // Clear the crash flip active status
+        flipOverAfterCrashMode = false;
+
         // If switch is used for arming then check it is not defaulting to on when the RX link recovers from a fault
         if (!isUsingSticksForArming()) {
             static bool hadRx = false;