envsubst - Fix when more than 2 arguments

[eric-hemasystems]

The previous code:

 files_count=$((  + 1 ))

Is effectively the same as:

files_count=1

I suspect the double space meant originaly it was:

files_count=$(( files_count + 1 ))

Somehow an editing error occurred and the files_count was removed. The result is the first argument is indexed at 0 (from above) all subsequent values are indexed at 1 with each later argument overwriting the previous. This means only the first and last argument are actually processed.

This fixes the code so that all arguments are processed.

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[eric-hemasystems]

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[eric-hemasystems]

@googlebot I signed it!

[google-cla[bot]]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[eric-hemasystems]

@googlebot I signed it!