Minor bug: Vanilla buildings don't show properly once RICO'd

[originalfoo]

Steps to reproduce:

1. Enable local RICO for a vanilla residential building, eg. tenement or highrise
2. Save/reload to see it in build menu ( due to Request: Update UI after adding new local configs #10 )
3. Open build menu - the vanilla building is there, but with several issues:
   • No asset icon (just a default "box" type icon)
   • Building name in tooltip is borken
   • Image in tool tip is missing (could it be auto-generated?)

I'm planning to go through a large number of vanilla growables and create RICO settings for them, in particular the some of the low residential houses that look like they should have 2-5 families in them.