opkg_manager: disable "key_up" after updating packages

Origin commit data
------------------
Commit: e3d845cec4
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2016-01-01 (Fri, 01 Jan 2016)

src/gui/opkg_manager.cpp

@@ -212,7 +212,9 @@ int COPKGManager::exec(CMenuTarget* parent, const string &actionKey)
 		} else
 			installed = true;
 		refreshMenu();
+		/* I don't think ending up at the last package in the list is a good idea...
 		g_RCInput->postMsg((neutrino_msg_t) CRCInput::RC_up, 0);
+		 */
 		return res;
 	}