Cleanup: Tweak panel layout of Online Players window.

This ensures panel borders not hidden behind other widgets.

src/network/network_gui.cpp

@@ -1336,15 +1336,17 @@ static const NWidgetPart _nested_client_list_widgets[] = {
 				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_CL_CLIENT_NAME_EDIT), SetMinimalSize(12, 14), SetDataTip(SPR_RENAME, STR_NETWORK_CLIENT_LIST_PLAYER_NAME_EDIT_TOOLTIP),
 			EndContainer(),
 		EndContainer(),
-		NWidget(NWID_HORIZONTAL),
-			NWidget(NWID_VERTICAL),
-				NWidget(WWT_MATRIX, COLOUR_GREY, WID_CL_MATRIX), SetMinimalSize(180, 0), SetResize(1, 1), SetFill(1, 1), SetMatrixDataTip(1, 0, STR_NULL), SetScrollbar(WID_CL_SCROLLBAR),
+	EndContainer(),
+	NWidget(NWID_HORIZONTAL),
+		NWidget(NWID_VERTICAL),
+			NWidget(WWT_MATRIX, COLOUR_GREY, WID_CL_MATRIX), SetMinimalSize(180, 0), SetResize(1, 1), SetFill(1, 1), SetMatrixDataTip(1, 0, STR_NULL), SetScrollbar(WID_CL_SCROLLBAR),
+			NWidget(WWT_PANEL, COLOUR_GREY),
 				NWidget(WWT_TEXT, COLOUR_GREY, WID_CL_CLIENT_COMPANY_COUNT), SetFill(1, 0), SetMinimalTextLines(1, 0), SetResize(1, 0), SetPadding(2, 1, 2, 1), SetAlignment(SA_CENTER), SetDataTip(STR_NETWORK_CLIENT_LIST_CLIENT_COMPANY_COUNT, STR_NULL),
 			EndContainer(),
-			NWidget(NWID_VERTICAL),
-				NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_CL_SCROLLBAR),
-				NWidget(WWT_RESIZEBOX, COLOUR_GREY),
-			EndContainer(),
+		EndContainer(),
+		NWidget(NWID_VERTICAL),
+			NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_CL_SCROLLBAR),
+			NWidget(WWT_RESIZEBOX, COLOUR_GREY),
 		EndContainer(),
 	EndContainer(),
 };