Add cvar reset stickers of a specific player

[crashzk]

Add cvar reset stickers of a specific player, something similar to the plugin Weapons & Knives.

    RegAdminCmd("sm_wsreset", CommandResetWeaponSkins, ADMFLAG_ROOT, "Resets weapon skins and knife of a specific player.");

https://github.com/kgns/weapons/blob/f5418f9a9ed9eae95a31d3b125971db0223ff11c/addons/sourcemod/scripting/weapons.sp#LL106C2-L106C13

Remembering that the reset would remove the stickers that the player placed by the plugin, but if the player's weapon already has a sticker by default, on his skin already, leave the skin stickers the same.