wmaker: Moved variable Ignore Wks Change into the workspace object in the global namespace

Took the opportunity to change its type: it was an integer, but it is
actually holding a yes/no status, so it is now defined as a boolean.

src/main.c

@@ -553,6 +553,7 @@ int main(int argc, char **argv)
 	w_global.program.signal_state = WSTATE_NORMAL;
 	w_global.timestamp.last_event = CurrentTime;
 	w_global.timestamp.focus_change = CurrentTime;
+	w_global.workspace.ignore_change = False;
 
 	/* setup common stuff for the monitor and wmaker itself */
 	WMInitializeApplication("WindowMaker", &argc, argv);