msys2-runtime: ignore the newly-added UI tests

In git-for-windows/msys2-runtime#95, I
introduced a new UI-based integration test. We do not need that to build
the package. The test is meant to be run in the `msys2-runtime`
repository's PRs _before_ the patches make it into `MSYS2-packages`.
Therefore it does not make sense to carry it here.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

msys2-runtime/update-patches.sh

@@ -43,7 +43,7 @@ git -c core.abbrev=7 \
 		--subject-prefix=PATCH \
 		--output-directory ../.. \
 		$base_tag.. ${merging_rebase_start:+^$merging_rebase_start} \
-		-- ':(exclude).github/' ||
+		-- ':(exclude).github/' ':(exclude)ui-tests/' ||
 die "Could not generate new patch set"
 
 patches="$(ls 0*.patch)" &&