Exclude matches with manifest.json instead of JS

Some wrong matches were being excluded with Javascript code testing the
location.href value. This commit deletes these Javascript tests and
implements them directly in the manifest.gjson file by placing them
inside the exclude_matches argument.

Change-Id: Idba4086b7061eaea837d7c7a3e3564c144535e42
diff --git a/templates/manifest.gjson b/templates/manifest.gjson
index 97deaba..5fd7fff 100644
--- a/templates/manifest.gjson
+++ b/templates/manifest.gjson
@@ -26,11 +26,13 @@
     },
     {
       "matches": ["https://support.google.com/*/thread/*"],
+      "exclude_matches": ["https://support.google.com/s/community*", "https://support.google.com/*/thread/new*"],
       "js": ["common/content_scripts.js", "content_scripts/thread_inject.js"],
       "run_at": "document_end"
     },
     {
       "matches": ["https://support.google.com/s/community*", "https://support.google.com/*/thread/*"],
+      "exclude_matches": ["https://support.google.com/*/thread/new*"],
       "js": ["common/content_scripts.js", "content_scripts/profileindicator_inject.js"]
     },
     {