replace a couple of tabs

src/engrave.c

@@ -1342,7 +1342,7 @@ engrave(void)
         gc.context.engraving.nextc = endc;
         if (neweng) {
             newsym(gc.context.engraving.pos.x, gc.context.engraving.pos.y);
-	}
+        }
         return 1; /* not yet finished this turn */
     } else { /* finished engraving */
         /* actions that happen after the engraving is finished go here */

src/mkobj.c

@@ -786,7 +786,7 @@ costly_alteration(struct obj *obj, int alter_type)
             set_bknown(obj, 1);
         if (shkp) {
             SetVoice(shkp, 0, 80, 0);
-	}
+        }
         verbalize("You %s %s %s, you pay for %s!",
                   alteration_verbs[alter_type], those, simpleonames(obj),
                   them);