Fix CppunitTest_configmgr_unit for --disable-report-builder

...after abd630e81b "Allow all hierarchical path
segments to be ['...'] quoted", which failed as the checked
MimeTypeClassIDRelations group is conditional on install:module="reportbuilder".
(See the comments at
<https://gerrit.libreoffice.org/c/core/+/151673/2#message-f029dd1877f8a946647456ed73a7b60f6dfc0e8f>
"Allow all hierarchical path segments to be ['...'] quoted".)

It looks like there is no other, non-conditional property with a slash in its
name, so the test now just tests the ['...'] syntax on an otherwise
unproblematic property name.  (Alternatively, we could have extended the
configuration data used by unit tests with such a problematicaly named
property.)

Change-Id: I820004a5b824326d86e67c158994f13e71ba135e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152184
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

configmgr/qa/unit/test.cxx

@@ -39,6 +39,7 @@
 #include <com/sun/star/uno/Sequence.hxx>
 #include <com/sun/star/uno/XInterface.hpp>
 #include <com/sun/star/util/XChangesBatch.hpp>
+#include <cppu/unotype.hxx>
 #include <cppuhelper/implbase.hxx>
 #include <osl/time.h>
 #include <rtl/ref.hxx>
@@ -214,13 +215,8 @@ void Test::testKeyFetch()
             s);
     }
     {
-        auto const v = getKey(
-            "/org.openoffice.Office.Embedding",
-            "MimeTypeClassIDRelations/['application/vnd.sun.xml.report.chart']");
-        OUString s;
-        CPPUNIT_ASSERT(v >>= s);
-        CPPUNIT_ASSERT_EQUAL(OUString("80243D39-6741-46C5-926E-069164FF87BB"), s);
-            // cf. officecfg/registry/data/org/openoffice/Office/Embedding.xcu
+        auto const v = getKey("/org.openoffice.System", "L10N/['Locale']");
+        CPPUNIT_ASSERT_EQUAL(cppu::UnoType<OUString>::get(), v.getValueType());
     }
 }