chore: template changes (#529)

* feat: fetch for default branch

Source-Author: Billy Jacobson <billyjacobson@users.noreply.github.com>
Source-Date: Thu Apr 15 20:13:42 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 898b38a6f4fab89a76dfb152480bb034a781331b
Source-Link: googleapis/synthtool@898b38a

* build(node): remove unused tokens

Source-Author: Benjamin E. Coe <bencoe@google.com>
Source-Date: Fri Apr 16 10:12:05 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: b33b0e2056a85fc2264b294f2cf47dcd45e95186
Source-Link: googleapis/synthtool@b33b0e2

* fix(node): default-branch should use $default_branch

Source-Author: Benjamin E. Coe <bencoe@google.com>
Source-Date: Fri Apr 16 10:25:52 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: c6706ee5d693e9ae5967614170732646590d8374
Source-Link: googleapis/synthtool@c6706ee

packages/google-cloud-monitoring/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-monitoring.git",
-        "sha": "11f9995c5def81a0a2e0598ddf026446d117b39d"
+        "sha": "62d2c5ebc91677198b22b3deb291b90d0b1aac3c"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "57c23fa5705499a4181095ced81f0ee0933b64f6"
+        "sha": "c6706ee5d693e9ae5967614170732646590d8374"
       }
     }
   ],