sculpt: constrain initial log-window size

This prevents the log terminal from adjusting itself to the whole screen
size before the leitzentrale window layout is applied. This intermediate
size can otherwise exhaust the 8 MiB of RAM quota of the log terminal.

Issue #3970

repos/gems/run/sculpt/leitzentrale.config

@@ -254,6 +254,7 @@
 				<resource name="RAM" quantum="8M"/>
 				<provides> <service name="Terminal"/> </provides>
 				<config>
+					<initial width="400"/>
 					<palette>
 						<color index="0" value="#2f3953"/>
 						<color index="8" value="#2f3953"/>