LoW: Initialize units in start events

previously this was done in side 1 turn 1 events because start events
wasn't synced.

After the fix for 21933 players now loose when they have no units after
start events, so we need to do this in a start event.

replacing check_victory with check_end_level after start events in
play_controller.cpp line 572 doesn't work because we still have the
check_victory in playmp_controller when waiting
for remote packages, that check_victory is needed in order to sync the
behavior of ai turns which calls check_victory after every action on the
local client.

data/campaigns/Legend_of_Wesmere/scenarios/chapter2/04_The_Elvish_Treasury.cfg

@@ -199,7 +199,7 @@ Chapter Two"
 
     [event]
         #Used this instead of prestart since global variables aren't synced before
-        name=side 1 turn 1
+        name=start
         [objectives]
             {OBJECTIVES}
         [/objectives]

data/campaigns/Legend_of_Wesmere/scenarios/chapter3/09_Bounty_Hunters.cfg

@@ -164,7 +164,7 @@ Chapter Three"
 
     #### Concentrated every wml related to the game setup into this single event ####
     [event]
-        name=side 1 turn 1
+        name=start
 
         # wmllint: recognize Arkildur
         # wmllint: recognize Tameril-Isimeril

data/campaigns/Legend_of_Wesmere/scenarios/chapter4/13_News_from_the_Front.cfg

@@ -89,7 +89,7 @@
 #endif
 
     [event]
-        name=side 1 turn 1
+        name=start
 
 #ifdef MULTIPLAYER
         {GET_PERSISTENT_RECALLS_FROM4 1 2 3 4 LoW_Chapter_One kalenz}

data/campaigns/Legend_of_Wesmere/scenarios/chapter4/14_Human_Alliance.cfg

@@ -348,7 +348,7 @@ Chapter Four"
     [/side]
 
     [event]
-        name=side 1 turn 1
+        name=start
 
 #ifdef MULTIPLAYER
         {GET_PERSISTENT_RECALLS_FROM4 1 5 6 7 LoW_Chapter_Three kalenz}