Issue Description: hidestyle: ocean doesn't render with ocean colour

• Dynmap Version: core=3.3-beta-4-617, plugin=3.3-beta-4-617
• Server Version: git-Paper-148
• Pastebin of Configuration.txt: https://pastebin.com/5SETL3z2
• Server Host (if applicable): localhost
• worlds.txt: worlds.txt
• Other Relevant Data/Screenshots:
• Steps to Replicate: install dynmap, set hidestyle to ocean, set visibilitylimits, do a fullrender, see the issue on the map.

[x ] I have looked at all other issues and this is not a duplicate

[x ] I have been able to replicate this

Rendering normally in current snapshots. Fixed by another change that caused those generic sections to also be initialized with a non-null biome (OCEAN for water, PLAINS for stone)

tested, and indeed fixed, thanks!