Fix names of experimental Mac FYI Retina testers in LUCI scheduler.

These were copy-pasted and edited instead of going back to the source
of truth, chromium_gpu_fyi.py.

TBR=nodir@chromium.org
NOTRY=true

Bug: 811799, 811814
Change-Id: Ic3f4e5063058940024adc330f7129f2d6fb24275
Reviewed-on: https://chromium-review.googlesource.com/954717
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541737}

infra/config/global/luci-scheduler.cfg

@@ -418,35 +418,35 @@ job {
 }
 
 job {
-  id: "Mac FYI Experimental Release (AMD)"
+  id: "Mac FYI Experimental Release (Intel)"
   # Triggered by "GPU FYI Mac Builder".
   acl_sets: "triggered-by-parent-builders"
   buildbucket: {
     server: "cr-buildbucket.appspot.com"
     bucket: "luci.chromium.ci"
-    builder: "Mac FYI Experimental Release (AMD)"
+    builder: "Mac FYI Experimental Release (Intel)"
   }
 }
 
 job {
-  id: "Mac FYI Experimental Release (Intel)"
+  id: "Mac FYI Experimental Retina Release (AMD)"
   # Triggered by "GPU FYI Mac Builder".
   acl_sets: "triggered-by-parent-builders"
   buildbucket: {
     server: "cr-buildbucket.appspot.com"
     bucket: "luci.chromium.ci"
-    builder: "Mac FYI Experimental Release (Intel)"
+    builder: "Mac FYI Experimental Retina Release (AMD)"
   }
 }
 
 job {
-  id: "Mac FYI Experimental Release (NVIDIA)"
+  id: "Mac FYI Experimental Retina Release (NVIDIA)"
   # Triggered by "GPU FYI Mac Builder".
   acl_sets: "triggered-by-parent-builders"
   buildbucket: {
     server: "cr-buildbucket.appspot.com"
     bucket: "luci.chromium.ci"
-    builder: "Mac FYI Experimental Release (NVIDIA)"
+    builder: "Mac FYI Experimental Retina Release (NVIDIA)"
   }
 }