MythContext::Impl::SaveDatabaseParams(): directly access the MythDB s…

…ingleton

This should allow moving the DatabaseSettingsCache to MythDB since
save can now be called at any time.

mythtv/libs/libmyth/mythcontext.cpp

@@ -701,7 +701,7 @@ bool MythContext::Impl::SaveDatabaseParams(
 
         // Use the new settings:
         m_dbParams = params;
-        gCoreContext->GetDB()->SetDatabaseParams(m_dbParams);
+        GetMythDB()->SetDatabaseParams(m_dbParams);
 
         // If database has changed, force its use:
         ResetDatabase(m_dbParams);