minor tower (lighting, bell_tower) labels rendered before symbols

[imagico]

Labels universally start at z17 while symbols for tower:type=lighting and tower:type=bell_tower only start at z18:

(also note that currently tower:construction has priority over tower:type - which is odd for tower:type=observation - where the symbol depicts a lattice construction)

[Nekzuris]

Came here because observation towers are still rendered with their construction type icon