fix incorrect border thickness for LSM border

Author: wardz

ClassicCastbars/core/Frames.lua

@@ -256,14 +256,14 @@ function ClassicCastbars:SetLSMBorders(castbar, db)
     end
 
     -- Apply backdrop if it isn't already active
-    if castbar.BorderFrameLSM.currentTexture ~= db.castBorder or castbar:GetHeight() ~= castbar.BorderFrameLSM.currentHeight then
+    if castbar.BorderFrameLSM.currentTexture ~= db.castBorder then
         castbar.BorderFrameLSM:SetBackdrop({
             edgeFile = db.castBorder,
-            tile = false, tileSize = 0,
-            edgeSize = castbar:GetHeight(),
+            tile = true, tileSize = 16,
+            edgeSize = 16,
+            insets = { left = 4, right = 4, top = 4, bottom = 4 }
         })
         castbar.BorderFrameLSM.currentTexture = db.castBorder
-        castbar.BorderFrameLSM.currentHeight = castbar:GetHeight()
     end
 
     castbar.Border:SetAlpha(0) -- hide default border