Fix creating of .flatpak bundle

Bug introduced in 726e6b2a

build.sh

@@ -14,4 +14,4 @@ fi
 echo ========== Building $APPID ================
 rm -rf app
 flatpak-builder $ARCH_OPT --ccache --require-changes --repo=hello-repo --subject="${APPID} ${VERSION}" ${EXPORT_ARGS-} app $FILE && \
-flatpak build-bundle $ARCH_OPT hello-repo/ $APPID-$(VERSION).$TARGET.flatpak $APPID master
+flatpak build-bundle $ARCH_OPT hello-repo/ $APPID-$VERSION.$TARGET.flatpak $APPID master