Add back to main menu button to online multiplayer layout

Author: MaximDude

Base.rte/GUIs/MultiplayerGameGUI.ini

@@ -221,3 +221,16 @@ Name = StatusLabel
 Anchor = Left, Top
 Text = To end current activity all players must press and hold BACKSPACE. Hold CTRL, ALT or SHIFT to check ping.
 HAlignment = Center
+
+[ButtonBackToMain]
+ControlType = BUTTON
+Parent = base
+X = 260
+Y = 340
+Width = 120
+Height = 20
+Visible = True
+Enabled = True
+Name = ButtonBackToMain
+Anchor = Left, Top
+Text = Back to Main Menu