When turning off create-account button, also turn off its title text.

Login-panel logic distinguishes "system grid" from "non-system grid." With
Oz's recent changes for pathfinding, now only agni and aditi are "system
grids;" anything else configured into grids.xml is a "non-system grid." The
difference is that when you select a "non-system grid" on the grid selector,
we turn off the "lost password?" link and the "create account" button -- since
how can we help with either if we don't recognize the grid? This logic already
existed, but only turned off the create-account button, leaving the new title
"CREATE YOUR ACCOUNT" over an empty corner of the login panel. Turn that off too.

indra/newview/llpanellogin.cpp

@@ -908,9 +908,11 @@ void LLPanelLogin::updateServer()
 
 			// update the login panel links 
 			bool system_grid = LLGridManager::getInstance()->isSystemGrid();
-	
-			sInstance->getChildView("create_new_account_btn")->setVisible( system_grid);
-			sInstance->getChildView("forgot_password_text")->setVisible( system_grid);
+
+			// Want to vanish not only create_new_account_btn, but also the
+			// title text over it, so turn on/off the whole layout_panel element.
+			sInstance->getChild<LLLayoutPanel>("links")->setVisible(system_grid);
+			sInstance->getChildView("forgot_password_text")->setVisible(system_grid);
 
 			// grid changed so show new splash screen (possibly)
 			loadLoginPage();