DevelopmentSettings: Remove redundant CacheType overrides

DevelopmentSettings: Remove redundant CacheType overrides

Follows-up 5a090c29822. This is no longer needed as of
7e0fb4fff6, which will add this to the generated LocalSettings.php
file automatically.

The installer now sets MainCacheType for CLI installs, the same
way as the web installer did already.

The secondary cache types have as default CACHE_ANYTHING (not
CACHE_NONE) and will automatically inherit from MainCacheType.

This commit unbreaks situations where developers have MainCache
set to something (e.g. Redis, or Memc) which after 5a090c29822
caused other types to go to APC instead of Memc.

Bug: T225496
Change-Id: Ib2824a6d316912daf09672de748726b91e4de449