tst_selftests: remove the Wayland skips

All tests pass on my machine and in the CI.

Change-Id: Ic7dde843f4c91cafdc6cfffdc9747d1326bda768
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

tests/auto/testlib/selftests/tst_selftests.cpp

@@ -646,11 +646,6 @@ bool TestLogger::shouldIgnoreTest(const QString &test, Throw throwing) const
         return true;
     }
 
-    if (!qEnvironmentVariableIsEmpty("WAYLAND_DISPLAY")) {
-        qDebug() << "TestLogger::shouldIgnoreTest() ignore" << test << "on wayland/xwayland!";
-        return true;
-    }
-
     // These tests are affected by timing and whether the CPU tick counter
     // is monotonically increasing. They won't work on some machines so
     // leave them off by default. Feel free to enable them for your own