AP_VideoTX: params always use set method

libraries/AP_VideoTX/AP_VideoTX.cpp

@@ -235,10 +235,10 @@ void AP_VideoTX::update(void)
     // manipulate pitmode if pitmode-on-disarm or power-on-arm is set
     if (has_option(VideoOptions::VTX_PITMODE_ON_DISARM) || has_option(VideoOptions::VTX_PITMODE_UNTIL_ARM)) {
         if (hal.util->get_soft_armed() && has_option(VideoOptions::VTX_PITMODE)) {
-            _options &= ~uint8_t(VideoOptions::VTX_PITMODE);
+            _options.set(_options & ~uint8_t(VideoOptions::VTX_PITMODE));
         } else if (!hal.util->get_soft_armed() && !has_option(VideoOptions::VTX_PITMODE)
             && has_option(VideoOptions::VTX_PITMODE_ON_DISARM)) {
-            _options |= uint8_t(VideoOptions::VTX_PITMODE);
+            _options.set(_options | uint8_t(VideoOptions::VTX_PITMODE));
         }
     }
 }