style: Remove trailing slash from static symlink (getsentry#10045)

This is very minor, but when symlinking a directory the trailing slash
is not needed and makes the output of `ls -l --classify` look a little
funny.

  $ ls -l --classify
  lrwxr-xr-x    1 evan staff     24 Oct  8 16:25 static -> src/sentry/static/sentry//

Where as with it removed it does not have the trailing slash:

  $ ls -l --classify
  lrwxr-xr-x    1 evan staff     24 Oct  8 16:25 static -> src/sentry/static/sentry/

Semantically it doesn't seem important [0].

[0]: https://unix.stackexchange.com/questions/7769/should-i-include-a-trailing-slash-in-a-symlink-to-a-directory

Author: evanpurkhiser

Diff for: static

@@ -1 +1 @@
-src/sentry/static/sentry/
+src/sentry/static/sentry