Fix irreflexive comparator in settings migration path sort

The version comparison lambda used >= 0, which returns true for
equal versions (compareVersions returns 0 for equal). This violates
strict weak ordering, causing undefined behavior in std::sort.

common/settings/settings_manager.cpp

@@ -812,7 +812,7 @@ bool SETTINGS_MANAGER::GetPreviousVersionPaths( std::vector<wxString>* aPaths )
                    if( !extractVersion( verB ) )
                        return true;
 
-                   return compareVersions( verA, verB ) >= 0;
+                   return compareVersions( verA, verB ) > 0;
                } );
 
     return aPaths->size() > 0;