core: Always normalize rsc blocks

So also from non-post forms (e.g. manage_schema calls).
This allows for referencing resources in blocks by name rather than by
ID. `m_rsc:update` will change the name to an id.

(cherry picked from commit 49c6937cedb312a29c23680d9851e4ba7edd3b15)
(cherry picked from commit 9696e578012e74ecfb579c8caed5cf3bd7b85787)