[ORL-76] Gradient() function doesnt work with `Fixed` blending

[orels1]

Original Post:

https://discord.com/channels/685559043044933680/1265157392308633692

I was able to fix this by inserting the following line at line 74 of GradientDrawer.cs: oldGradCopy.mode = savedGradient.mode;

_{From SyncLinear.com | ORL-76}