Adjust spacing of buttons in cargo payments rate graph

src/graph_gui.cpp

@@ -1392,9 +1392,10 @@ static const NWidgetPart _nested_cargo_payment_rates_widgets[] = {
 		NWidget(NWID_HORIZONTAL),
 			NWidget(WWT_EMPTY, COLOUR_BROWN, WID_CPR_GRAPH), SetMinimalSize(495, 0), SetFill(1, 1), SetResize(1, 1),
 			NWidget(NWID_VERTICAL),
+				NWidget(NWID_SPACER), SetMinimalSize(0, 4),
 				NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_CPR_DAYS), SetDataTip(STR_GRAPH_CARGO_DAYS_MODE, STR_GRAPH_CARGO_TOOLTIP_DAYS_MODE), SetFill(1, 0),
 				NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_CPR_SPEED), SetDataTip(STR_GRAPH_CARGO_SPEED_MODE, STR_GRAPH_CARGO_TOOLTIP_SPEED_MODE), SetFill(1, 0),
-				NWidget(NWID_SPACER), SetMinimalSize(0, 24), SetFill(0, 1),
+				NWidget(NWID_SPACER), SetMinimalSize(0, 16), SetFill(0, 1),
 				NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_CPR_ENABLE_CARGOES), SetDataTip(STR_GRAPH_CARGO_ENABLE_ALL, STR_GRAPH_CARGO_TOOLTIP_ENABLE_ALL), SetFill(1, 0),
 				NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_CPR_DISABLE_CARGOES), SetDataTip(STR_GRAPH_CARGO_DISABLE_ALL, STR_GRAPH_CARGO_TOOLTIP_DISABLE_ALL), SetFill(1, 0),
 				NWidget(NWID_SPACER), SetMinimalSize(0, 4),