Tests: add tst_splitview.qml to pro file

Change-Id: I17d9f9da317e50b1f406cebd71598547e1aa031f
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

tests/auto/controls/controls.pro

@@ -39,4 +39,5 @@ OTHER_FILES += \
     $$PWD/data/tst_toolbar.qml \
     $$PWD/data/tst_toolbutton.qml \
     $$PWD/data/tst_checkbox.qml \
-    $$PWD/data/tst_groupbox.qml
+    $$PWD/data/tst_groupbox.qml \
+    $$PWD/data/tst_splitview.qml