Revert "Low: Work around OOS caused by [advancefrom]"

for master, a better method exists

This reverts commit 85868544cc.

data/campaigns/Legend_of_Wesmere/_main.cfg

@@ -28,9 +28,6 @@
 #endif
 
 [campaign]
-    # "extra_defines" cause OOS errors if used to change unit types (e.g. their advancements)
-    # Using event below instead to change advancement. Though players won't that they can advance to this unit.
-    # leaving extra define so it looks still right from the hosts perspective.
     extra_defines=ENABLE_DWARVISH_RUNESMITH
     id=LOW
     define=CAMPAIGN_LOW
@@ -59,21 +56,6 @@
     {CAMPAIGN_DIFFICULTY NORMAL "units/elves-wood/lord.png~RC(magenta>brown)" ( _ "Lord") ( _ "Normal")} {DEFAULT_DIFFICULTY}
     {CAMPAIGN_DIFFICULTY HARD   "units/elves-wood/high-lord.png~RC(magenta>brown)" ( _ "High Lord") ( _ "Challenging")}
 
-    [event]
-        name=unit placed
-        first_time_only=no
-        [filter]
-            type=Dwarvish Fighter
-        [/filter]
-
-        [modify_unit]
-            [filter]
-                id=$unit.id
-            [/filter]
-            advances_to=Dwarvish Steelclad,Dwarvish Runesmith
-        [/modify_unit]
-    [/event]
-
     [about]
         title= _ "Creator and Lead Designer"
         [entry]