guf-show-demo: Update to fix shader bug

The shader bug in Yocto Dunfell is fixed with the latest version of the
guf-show-demo tool. It is fixed by adding precision qualifiers to the
shader code.

Pull the latest version "f795b1c360b471a3bc01be2c42667c8c42aa1dc6"

recipes-guf/guf-show-demo/guf-show-demo.bb

@@ -14,8 +14,7 @@ SRC_URI = "git://gfweb:29418/tools/guf/guf-demo.git;branch=demo_219design;;proto
 	file://init.d/guf-show-demo \
 	"
 
-SRCREV = "58faba0bd690fe0e8b675fd0ae215d45f26f2d6c"
-
+SRCREV = "f795b1c360b471a3bc01be2c42667c8c42aa1dc6"
 
 PV = "1.0"