Remove an extraneous space character.

The space prevents "repo upload" from running on my machine:

    $ repo upload .
    [COMMIT 50e35bea87f0] Use Soong modules for the NDK's extra STL libraries
    [FAILED] gofmt
      FILES: ('cc/cc.go',)    <standard input>
    [FAILED] repohooks for platform/build/soong failed
    FATAL: Preupload failed due to above error(s).
    For more info, please see:
    https://android.googlesource.com/platform/tools/repohooks/

Bug: none
Test: repo upload
Change-Id: I6b5de8f5d4edb38ca26a999e561df10262844b3d