Fix optimize Flutter SDK release manifest usage

Author: socheatsok78

action.sh

@@ -20,7 +20,9 @@ if [ ! -f "$FLUTTER_RELEASE_MANIFEST_FILE" ]; then
 	if [ $? -ne 0 ]; then
 		echo -e "::warning::Failed to fetch Flutter SDK release manifest."
 	fi
-elif [ -f "$FLUTTER_RELEASE_MANIFEST_FILE" ]; then
+fi
+
+if [ -f "$FLUTTER_RELEASE_MANIFEST_FILE" ]; then
 	echo "Using cached Flutter SDK release manifest."
 
 	# Obtain the base URL and override FLUTTER_RELEASE_BASE_URL