installer patchl, output text formatting

Console output text did not show properly for lines 230, 231

Author: PetrNovota

docs/source/_static/install_depthai.sh

@@ -227,8 +227,8 @@ else
   exit 99
 fi
 
-echo '\n\n:::::::::::::::: INSTALATION COMPLETE ::::::::::::::::\n'
-echo '\nTo run demo app write <depthai_launcher> in terminal.'
+echo $'\n\n:::::::::::::::: INSTALATION COMPLETE ::::::::::::::::\n'
+echo $'\nTo run demo app write <depthai_launcher> in terminal.'
 read -rsp $'Press ANY KEY to finish and run the demo app...\n' -n1 key
 echo "STARTING DEMO APP."
 python "$DEPTHAI_DIR/launcher/launcher.py" -r "$DEPTHAI_DIR"