MWEB-965 Changes in HTTP codes returned by maps service

The changes are connected to recent work on refactoring `interactive-maps` service code. We changed the HTTP status codes while refactoring CRUD files:
* https://github.com/Wikia/interactive-maps/commit/26ab7515ea683caee322935e554c73339b3b0d33,
* https://github.com/Wikia/interactive-maps/commit/cfae0f9573450c59b61077d80029a0ee3b5341c3,
* https://github.com/Wikia/interactive-maps/commit/883d1ae7f7f9c73c43de0dc822fb4cb80634c3a4,
* https://github.com/Wikia/interactive-maps/commit/bade108fd1053e5482492035ca3439fc5bb9d8ee,
* https://github.com/Wikia/interactive-maps/commit/3d525926cef591ff054746b43bd49194be73b5f1.

The change of HTTP code statuses will fix our automation Python changes for maps' API.

These small PHP changes are connected to ones mentioned above. After tests all connected pull requests will get merged:
* https://github.com/Wikia/interactive-maps/pull/214