[LLIMMgr/LLIMPanel Revision] Fix PinTalkViewOpen=false mechanics

If the user is holding a modifier key with enter, it bypasses the unpinned setting
If a chat is popped out, this setting now only minimizes that chat, not toggles the main communications floater.
LLIMPanel::closeIfNotPinned() now condenses the logic.

Also makes LLIMMgr::toggle() non-static and requiring no args.

indra/newview/llimview.h

@@ -143,7 +143,7 @@ public:
 	// good connection.
 	void disconnectAllSessions();
 
-	static void	toggle(void*);
+	void toggle();
 
 	BOOL hasSession(const LLUUID& session_id);