re-add 180s and IRS wallkicks after inheritance change

fixes results of 323c457809

tetris/rulesets/standard.lua

@@ -8,6 +8,8 @@ SRS.hash = "Standard"
 SRS.softdrop_lock = false
 SRS.harddrop_lock = true
 
+SRS.enable_IRS_wallkicks = true
+
 SRS.MANIPULATIONS_MAX = 15
 
 SRS.wallkicks_line = {
@@ -108,4 +110,6 @@ end
 
 function SRS:canPieceRotate() return true end
 
+function SRS:get180RotationValue() return 2 end
+
 return SRS