Some spell fixes

First PR, sorry for the codestyle (don't know how to make the code aligned).

Some of theses fixes may be incorrect, feel free to modify them as you want.

GetHealingDoneInPastSecs() and GetDamageDoneInPastSecs() functions are for me so don't take care of them.

Corrected spells have been tested and are working on the last TC rev https://github.com/TrinityCore/TrinityCore/commit/7e0b8d69d644bfe44c9e2673d774bfd21db8f83e

Credits goes to @Souler, @Vincent-Michael, @Oneb1t and me. Thank you guys.

Hope this could be usefull.