Fix updateSteamDeckLastVers

Co-authored-by:  Eamonn Rea <[email protected]>

steamtinkerlaunch

@@ -26725,7 +26725,7 @@ function checkSteamDeckLastVers {
 
 function updateSteamDeckLastVers {
 	# This function updates the 'lastvers' file after a dependency update if there was a version change
-	if [ "$( checkSteamDeckSTLUpdated )" -eq 1 ]; then
+	if checkSteamDeckSTLUpdated; then
 		echo "$PROGVERS" > "$STLSTEAMDECKLASTVERS"
 	fi
 }