(fix/texture): Desaturate state lost on SetTexture

Fixes #93
Also normalize SetDesaturated calls to use booleans instead of numeric flags.

(cherry picked from commit 47dce3a9d5ba23c170f002b323a11ed2a5c5e206)

WeakAuras/RegionTypes/Texture.lua

@@ -11,6 +11,7 @@ local default = {
   height = 200,
   color = {1, 1, 1, 1},
   blendMode = "BLEND",
+  textureWrapMode = "CLAMPTOBLACKADDITIVE",
   rotation = 0,
   mirror = false,
   rotate = false,