dashboard: fix regexps describing ARM trybot test sharding

Whoops.

Change-Id: Iddaf0a623c842f95c27629d67246483a842bf4ca
Reviewed-on: https://go-review.googlesource.com/10145
Reviewed-by: Minux Ma <minux@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index e28793d..dc0e265 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -282,7 +282,7 @@
 		IsReverse:    true,
 		env: []string{
 			"GOROOT_BOOTSTRAP=/usr/local/go",
-			"GOTESTONLY=^go_test:[a-m]$",
+			"GOTESTONLY=^go_test:[a-m]",
 		},
 	})
 	addBuilder(BuildConfig{
@@ -292,7 +292,7 @@
 		IsReverse:    true,
 		env: []string{
 			"GOROOT_BOOTSTRAP=/usr/local/go",
-			"GOTESTONLY=^go_test:[n-z]$",
+			"GOTESTONLY=^go_test:[n-z]",
 		},
 	})
 	addBuilder(BuildConfig{
@@ -322,7 +322,7 @@
 		IsReverse:    true,
 		env: []string{
 			"GOROOT_BOOTSTRAP=/usr/local/go",
-			"GOTESTONLY=!^(go_test:|test$|cgo_test$|runtime:cpu124$|)",
+			"GOTESTONLY=!^(go_test:|test$|cgo_test$|runtime:cpu124$)",
 		},
 	})