Fix farm overview tab layout

It can now hold up to 6 different lines again, everything beyond will
still be broken. Suggesting a scrollable area instead of further down-
sizing there though.

Multiple in- or output resources per line are also still a bit broken,
because the cogs icon doesn't cover 100% of the background arrows.
For details, click on any pastry shop.

content/gui/xml/ingame/tabwidget/farm/overview_farm.xml

@@ -25,10 +25,7 @@
 		<Label name="capacity_utilization" helptext="Capacity utilization" />
 	</HBox>
 
-	<VBox name="production_lines" position="20,90" />
+	<VBox name="production_lines" position="20,87" padding="-13" />
 
 </Container>
 </Container>
-
-
-