Fix TDECModuleInfo::needsTest() returning always false

Properties such as this first make a call to the protected loadAll() method if the modules desktop files
have not been processed yet, but such a call was for some reason missing from the needsTest() function,
resulting in the method always returning false unless another function called loadAll() first.

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>
(cherry picked from commit 8166c26c7a)

tdeutils/tdecmoduleinfo.cpp

@@ -229,6 +229,9 @@ TDECModuleInfo::isHiddenByDefault() const
 
 bool TDECModuleInfo::needsTest() const
 {
+  if (!_allLoaded)
+    const_cast<TDECModuleInfo*>(this)->loadAll();
+
   return d->testModule;
 }