[c12749] Remove effect for spell 64503

Will be handled in script library. For details please check https://github.com/scriptdev2/scriptdev2/commit/8502cdfa64f09028d194adec68656efe59b3ea2f

(based on commit [12548] - 1d39700)
[c12750] Update spells 62374 and 62907

* limit spell targets of spell 62374
* implement spell effect for spell 62907

(based on commit [12549] - 302b73a)