Merge pull request 'OFF -> NORMAL: Set transition source modes' (#131) from off_to_normal_transition_sources into develop

Reviewed-on: eive/fsfw#131

src/fsfw/devicehandlers/DeviceHandlerBase.cpp

@@ -565,6 +565,9 @@ void DeviceHandlerBase::setMode(Mode_t newMode, uint8_t newSubmode) {
    */
   if (newMode == MODE_ON and continueToNormal) {
     continueToNormal = false;
+    // TODO: Check whether the following two lines are okay to do so.
+    transitionSourceMode = MODE_ON;
+    transitionSourceSubMode = submode;
     mode = _MODE_TO_NORMAL;
     return;
   }