Remove insignification from CMake tests.

The failing test is working, now that a fix has been added to qtbase.

Task-number: QTBUG-27087
Change-Id: I4e4a74a49cf080a94de582da22870f8c01797ad4
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

tests/auto/cmake/cmake.pro

@@ -2,6 +2,4 @@
 # Cause make to do nothing.
 TEMPLATE = subdirs
 
-# QtUiTools test fail on Windows/MSVC because it's a static library - QTBUG-27087
-if(win32|mac):CONFIG += insignificant_test
 CONFIG += ctest_testcase