Update instfs config to be the same as instfs setup

flag=none
qa-risk: none

Test plan
- Copy the config for instfs from the example
  files and have it work without it giving you
  a CORS error when you try to upload a file
  to a course

Change-Id: Iacd6ff6d6f9a33786ec12864df6adfc8ed765491
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/317828
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Build-Review: Cody Cutrer <cody@instructure.com>
Reviewed-by: Eric Saupe <eric.saupe@instructure.com>
QA-Review: Eric Saupe <eric.saupe@instructure.com>
Product-Review: Mysti Lilla <mysti@instructure.com>

config/dynamic_settings.yml.example

@@ -76,7 +76,7 @@ development:
         app_key: 'xyzzy'
     # another service
     inst-fs:
-      app-host: "http://api.instfs.docker"
+      app-host: "http://api.inst-fs.docker"
       # this is just "super-sekret-value", base64-encoded:
       secret: "c3VwZXItc2VrcmV0LXZhbHVlCg=="
     pandata:

docker-compose/config/dynamic_settings.yml

@@ -36,7 +36,7 @@ development:
         app-host: "http://rce.canvas.docker:3000"
     # another service
     inst-fs:
-      app-host: "http://api.instfs.docker"
+      app-host: "http://api.inst-fs.docker"
       # this is just "super-sekret-value", base64-encoded:
       secret: "c3VwZXItc2VrcmV0LXZhbHVlCg=="
     pandata: