Tests: remove "wait" in cleanupTestCase

For SpinBox and TableView testcases.

This function has been copied from other tests but
it was probably a hack to work around an old bug.

This should not be needed so removing it.

Change-Id: I0b9f6620fdc89a8f2125cf9bc9412cb45b21b500
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>

tests/auto/qtdesktop/data/tst_button.qml

@@ -48,10 +48,6 @@ TestCase {
     width:400
     height:400
 
-    function cleanupTestCase() {
-        wait(100) //wait for a short while to make sure no leaked textures
-    }
-
     function test_defaultbutton() {
         var tmp = Qt.createQmlObject('import QtDesktop 1.0; Button {id: button1}', testCase, '');
         compare(tmp.defaultbutton, false);

tests/auto/qtdesktop/data/tst_shortcuts.qml

@@ -65,10 +65,6 @@ TestCase {
         rootObject.forceActiveFocus();
     }
 
-    function cleanupTestCase() {
-        wait(100) //wait for a short while to make sure no leaked textures
-    }
-
     function test_shortcut_data() {
         return [
             { key: Qt.Key_A, modifier: Qt.NoModifier, expected: "a pressed" },