Move shebang to the beginning of the detect script

[cdwilson]

No description provided.

[ladyada]

@evaherrada this affects spdx detection filter

[cdwilson]

this affects spdx detection filter

Is this filter something specific to adafruit? The reuse addheader docs mention the following:

Shebangs are always preserved at the top of the file.

[ladyada]

yah its our own regexp, no worries, just fyi to @evaherrada !

[makermelissa]

Should I wait on merging this until the script is updated?

[ladyada]

i dont know we run spdx check on this repo, its more of a reminder to eva! cause we will bump into this again!

[makermelissa]

Makes sense to me. Thanks.