Switch to a fork of the FidelityFX-SDK.

This updates to FSR3 3.0.4 and includes the following patches:

- GPUOpen-LibrariesAndSDKs/FidelityFX-SDK#12
- GPUOpen-LibrariesAndSDKs/FidelityFX-SDK#23
- GPUOpen-LibrariesAndSDKs/FidelityFX-SDK#56
- GPUOpen-LibrariesAndSDKs/FidelityFX-SDK#57

...as well as adding additional exports required here.

Author: lzlrd

.gitmodules

@@ -1,4 +1,4 @@
-[submodule "dependencies/FidelityFX-SDK"]
-	path = dependencies/FidelityFX-SDK
-	url = https://github.com/GPUOpen-LibrariesAndSDKs/FidelityFX-SDK.git
-	branch = release-FSR3-3.0.3
+[submodule "dependencies/FidelityFX-SDK"]
+	path = dependencies/FidelityFX-SDK
+	url = https://github.com/lazerl0rd/FidelityFX-SDK.git
+	branch = release-FSR3-3.0.4