Tests: Fix typo in qfuture test

Fix typo so tst_qfuture on platforms without exceptions can be build
correctly.

Change-Id: I32c12effdda13da9c8669bfddd362acc1c8a14c7
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>

tests/auto/corelib/thread/qfuture/tst_qfuture.cpp

@@ -4540,7 +4540,7 @@ void tst_QFuture::whenAllIteratorsWithFailed()
     p1.finish();
     QVERIFY(finished);
 #else
-    QSKIP("Exceptions are disabled, skipping the test")
+    QSKIP("Exceptions are disabled, skipping the test");
 #endif
 }