Remove temporary config.ini after the test

Change-Id: I7bc0c6554b4d5e870a49740b2b7243d9a9246ca8
Signed-off-by: Aurimas Fišeras <aurimas@members.fsf.org>
Reviewed-on: https://gerrit.libreoffice.org/72063
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

tools/qa/cppunit/test_config.cxx

@@ -35,6 +35,8 @@ public:
         osl::File::copy(maOriginalConfigFile, maConfigFile);
     }
 
+    virtual void tearDown() override { osl::File::remove(maConfigFile); }
+
     void testHasGroup()
     {
         Config aConfig(maConfigFile);