Install Firmware: Fix resources not being cleanup after flashing

Made change to APM and PX4 flashing to cleanup all resources on completion on flashing wether it’s complete, failure or cancel outcomes
Action Widget: Fix spelling mistake for word ‘ground’
Airspeed Setup: Fix Layout Issues
Stylesheet: Combobox improvements for background color display.
PFD QML: Updates for scaling and position of Roll & Compass Indicators