Remove unused and buggy stand2 sequence from ants

They were unused, their settings were wrong,
and even if fixed they'd make idle ants look
glitchy, because the game switches between
stand sequences randomly.

mods/ra/sequences/infantry.yaml

@@ -1289,9 +1289,6 @@ zombie:
 ant:
 	stand: ant1
 		Facings: 8
-	stand2: ant1
-		Start: 8
-		Length: 8
 	run: ant1
 		Start: 8
 		Length: 8
@@ -1314,9 +1311,6 @@ ant:
 fireant:
 	stand: ant2
 		Facings: 8
-	stand2: ant2
-		Start: 8
-		Length: 8
 	run: ant2
 		Start: 8
 		Length: 8
@@ -1339,9 +1333,6 @@ fireant:
 scoutant:
 	stand: ant3
 		Facings: 8
-	stand2: ant3
-		Start: 8
-		Length: 8
 	run: ant3
 		Start: 8
 		Length: 8