Increase thread timeout to reduce flakiness.

Taken from upstream:
https://github.com/xbmc/xbmc/commit/574b0182d8b641fd24029f372ebdcccc897123e2

diff --git a/xbmc/threads/test/TestEvent.cpp b/xbmc/threads/test/TestEvent.cpp
index 42fb8c2fc609..40e644c0ed3c 100644
--- a/xbmc/threads/test/TestEvent.cpp
+++ b/xbmc/threads/test/TestEvent.cpp
@@ -484,7 +484,7 @@ TEST(TestEvent, GroupTimedWait)
   EXPECT_TRUE(w3.result == NULL);
 
   // this should end given the wait is for only 50 millis
-  EXPECT_TRUE(waitThread3.timed_join(MILLIS(100)));
+  EXPECT_TRUE(waitThread3.timed_join(MILLIS(200)));
 
   EXPECT_TRUE(!w3.waiting);
   EXPECT_TRUE(w3.result == NULL);
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<tr><td><span title='2020-06-24 19:55:22 +0100'>2020-06-24</span></td><td><a href='/guix/commit/nix/libstore/.gitignore?id=cd43b55da7ab51c996a7a3449c78f2a493616106'>nix: Tweak .gitignore files.</a><span class='msg-avail'>...<span class='msg-tooltip'>Remove .gitignore entries where they match source files that are tracked in
Git.  This is relevant to me at least, as some code searching tools use
.gitignore files and will ignore matched files.
</span></span></td><td>Christopher Baines</td></tr>