Rename AddressMode::MirroredRepeat to MirrorRepeat.

This is to match the name in the WeBGPU IDL.

BUG=dawn:22

Change-Id: I0a4a7b62afa30cfd699d90efb2dd0c085778883b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8624
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Yunchao He <yunchao.he@intel.com>

src/dawn_native/opengl/SamplerGL.cpp

@@ -61,7 +61,7 @@ namespace dawn_native { namespace opengl {
             switch (mode) {
                 case dawn::AddressMode::Repeat:
                     return GL_REPEAT;
-                case dawn::AddressMode::MirroredRepeat:
+                case dawn::AddressMode::MirrorRepeat:
                     return GL_MIRRORED_REPEAT;
                 case dawn::AddressMode::ClampToEdge:
                     return GL_CLAMP_TO_EDGE;