luci: update two more references to fuchsia-{arm64,x64}-cast.

Tbr: martiniss@chromium.org
Bug: 877264
Change-Id: Icd73a35287a406a2fbe87669cbb5f472a0b4d413
Reviewed-on: https://chromium-review.googlesource.com/c/1331417Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607274}

infra/config/global/cr-buildbucket.cfg

@@ -3002,10 +3002,10 @@ buckets {
       }
     }
     builders { mixins: "linux-try" name: "fuchsia_arm64" }
-    builders { mixins: "linux-try" name: "fuchsia_arm64_cast_audio" }
+    builders { mixins: "linux-try" name: "fuchsia-arm64-cast" }
     builders { mixins: "linux-try" name: "fuchsia-fyi-x64-dbg" }
     builders { mixins: "linux-try" name: "fuchsia_x64" }
-    builders { mixins: "linux-try" name: "fuchsia_x64_cast_audio" }
+    builders { mixins: "linux-try" name: "fuchsia-x64-cast" }
     builders { mixins: "linux-try" name: "leak_detection_linux" }
     builders { mixins: "linux-try" name: "linux-blink-gen-property-trees" }
     builders { mixins: "linux-try" name: "linux-blink-heap-incremental-marking" }

infra/config/global/luci-milo.cfg

@@ -4299,7 +4299,7 @@ consoles {
     name: "buildbucket/luci.chromium.try/fuchsia_arm64"
   }
   builders {
-    name: "buildbucket/luci.chromium.try/fuchsia_arm64_cast_audio"
+    name: "buildbucket/luci.chromium.try/fuchsia-arm64-cast"
   }
   builders {
     name: "buildbucket/luci.chromium.try/fuchsia-fyi-x64-dbg"
@@ -4308,7 +4308,7 @@ consoles {
     name: "buildbucket/luci.chromium.try/fuchsia_x64"
   }
   builders {
-    name: "buildbucket/luci.chromium.try/fuchsia_x64_cast_audio"
+    name: "buildbucket/luci.chromium.try/fuchsia-x64-cast"
   }
   builders {
     name: "buildbucket/luci.chromium.try/leak_detection_linux"