[lldb] Fix incorrect test data in FileSpecTest.IsRelative

Found by clang-tidy's bugprone-suspicious-missing-comma.

GitOrigin-RevId: 0f3ed7a48dba2eb3ad726fc8f513159baca13b71
diff --git a/unittests/Utility/FileSpecTest.cpp b/unittests/Utility/FileSpecTest.cpp
index ad2e328..3dd3552 100644
--- a/unittests/Utility/FileSpecTest.cpp
+++ b/unittests/Utility/FileSpecTest.cpp
@@ -305,7 +305,7 @@
     "~/",
     "~/a",
     "~/a/",
-    "~/a/b"
+    "~/a/b",
     "~/a/b/",
     "/foo/.",
     "/foo/..",