BASE: Show error description when game fails to run

The previous "not...any engine" message was appropriate in the past (circa
1a938956ec), but with changes over time it began appearing even for
other error conditions (e.g. some game data files missing); thus it was
sometimes incorrect.

base/main.cpp

@@ -870,7 +870,7 @@ extern "C" int scummvm_main(int argc, const char * const argv[]) {
 		} else {
 			DebugMan.removeAllDebugChannels();
 
-			GUI::displayErrorDialog(_("Could not find any engine capable of running the selected game"));
+			GUI::displayErrorDialog(result, _("Error running game:"));
 
 			// Clear the active domain
 			ConfMan.setActiveDomain("");