tint test-runner: exclude .fxc/dxc.hlsl from glob

Bug: tint:1620
Change-Id: I5d5182025c140f71b69d3a9e540ae9ef8aec04e3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97003
Commit-Queue: Ben Clayton <bclayton@google.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>

tools/src/cmd/test-runner/main.go

@@ -144,7 +144,8 @@ func run() error {
 					"**.expected.wgsl",
 					"**.expected.spvasm",
 					"**.expected.msl",
-					"**.expected.hlsl",
+					"**.expected.fxc.hlsl",
+					"**.expected.dxc.hlsl",
 					"**.expected.glsl"
 				]
 			}