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After CL:2515787, the SWA main.html auto-generator generates an error

  Did you mean print(line + '    ' + _SWA) ?

and stops a gn clean simple chrome flow ChromeOS build. Apply the fix
suggested to fix build error (works before and after CL:2515787).

Tbr: lucmult
Bug: 1113981
Change-Id: I454674756ab2bcf24c65d4ca1b815fc2e5b30201
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585261Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Auto-Submit: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836287}