Let the player area grow.

After it's fully grown it's possible to let the list do it's own
resizing.

data/gui/default/window/lobby_main.cfg

@@ -294,6 +294,7 @@
 
 #define PLAYERLISTBOX
 [grid]
+	vertical_grow = "true"
 	[row]
 		[column]
 			[grid]
@@ -327,6 +328,7 @@
 	[row]
 		[column]
 			horizontal_grow = "true"
+			vertical_grow = "true"
 			[scrollbar_panel]
 				[definition]
 					{ONE_PLAYERLISTBOX "active_game" _"Selected game"}
@@ -337,6 +339,16 @@
 			[/scrollbar_panel]
 		[/column]
 	[/row]
+	[row]
+		# This last row spacer is there to make sure the extra height goes to
+		# the spacer. The spacer grows so it's easy to add a debug_border_mode
+		grow_factor = 1
+		[column]
+			vertical_grow = "true"
+		[spacer]
+		[/spacer]
+		[/column]
+	[/row]
 [/grid]
 #enddef
 
@@ -586,6 +598,7 @@
 		border = "top"
 		border_size = 5
 		horizontal_grow = "true"
+		vertical_grow = "true"
 		{PLAYERLISTBOX}
 {HORIZONTAL_END}
 #enddef
@@ -650,7 +663,7 @@
 								[/grid]
 							[/column]
 							[column]
-								vertical_alignment = "top"
+								vertical_grow = "true"
 								{_GUI_CONTROL_AREA}
 							[/column]
 						[/row]