Gold: Fix prom port by fixing app_title.

The space in app_title was causing --prom_port to
never be read.

BUG=skia:

Change-Id: Ie6dc2066e395bd6cd3fdbaab63dbd30a045b3741
Reviewed-on: https://skia-review.googlesource.com/8668
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
diff --git a/golden/sys/skiacorrectness-stage.service b/golden/sys/skiacorrectness-stage.service
index 03e8e3f..a0a8e41 100644
--- a/golden/sys/skiacorrectness-stage.service
+++ b/golden/sys/skiacorrectness-stage.service
@@ -24,7 +24,7 @@
     --cache_size=20 \
     --backfill_tiles=2 \
     --resources_dir=/usr/local/share/skiacorrectness/frontend \
-    --app_title='Staging Gold' \
+    --app_title=Staging_Gold \
     --prom_port=:20001
 
 Restart=always