e2e: remove strange space from source
e2e: remove strange space from source

This is to fix following build error from esbuild.
```
✘ [ERROR] Unexpected "\u200b"

    ../../third_party/devtools-frontend/src/test/e2e/sources/can-format-sourcecode_test.ts:62:6:
      62 │        '',
         ╵       ~

```

This is come from
https://chromium.googlesource.com/devtools/devtools-frontend/+/c1ab112d9002d5c3b3bb70cf2839bac182f0cdb5%5E%21/test/e2e/sources/can-format-sourcecode_test.ts
but is it intentional?

Bug: chromium:1278663
Change-Id: Ib30878a1e3146b736cf088b6a550f3c162e2a4f3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3330075
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

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