fix: grep pattern fixed to remove line comments

[langbein-daniel]

:wave: I did some awesome work for the Pelias project and would love for everyone to have a look at it and provide feedback.

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Here's the reason for this change :rocket:

1. Running pelias yields the error grep: warning: stray \ before #.
2. Line comments were not removed by grep pattern.

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Here's what actually got changed :clap:

1. This can be fixed by not escaping # in the grep pattern.
2. The grep pattern: There was a end-of-line anchor $ after a pattern for white-spaces \s* before the line-comment character #. This was changed to ^\s*# which remove lines starting with 0 or more whitespace characters followed by #.

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Here's how others can test the changes :eyes:

Run the pelias command and check if loading .env variables does still work as expected/is now fixed. Especially if line comments (with and without whitespace before #) get removed.