Light-spell is clerical, if playing a priest

Ideally the spell adjustment should be in o_init, but by that time
hero's role has not yet been set.

doc/fixes3-7-0.txt

@@ -1575,6 +1575,7 @@ elementals do double damage on their home plane
 water elementals move slightly more slowly
 the "totally digested" instadeath timer is much faster
 slow monster effects are more effective against faster enemies
+light-spell is clerical, if playing a priest
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository

src/role.c

@@ -2084,6 +2084,9 @@ role_init(void)
     /* 0 or 1; no gods are neuter, nor is gender randomized */
     svq.quest_status.godgend = !strcmpi(align_gtitle(alignmnt), "goddess");
 
+    if (Role_if(PM_CLERIC))
+        objects[SPE_LIGHT].oc_skill = P_CLERIC_SPELL;
+
 #if 0
 /*
  * Disable this fixup so that mons[] can be const.  The only