Drop support for DEBUG in grep 🐛

[jamacku]

It doesn't work as expected. Also, the debug output is not very useful.

It fixes the issue when matched strings are outputted into the console:

#!/bin/bash
#!/bin/bash
#!/bin/bash
#!/bin/bash
#!/bin/bash
#!/bin/bash
#!/bin/bash


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::: Used Versions :::
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ShellCheck: 0.9.0
csutils: 3.0.4


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::: Differential ShellCheck :::
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📜 List of shell scripts for scanning

ℹ️ No Fixes!

🥳 No defects added. Yay!

✅ SARIF report was successfully uploaded to GitHub

[codecov]

Codecov Report

Merging #322 (9536bc8) into main (c9cc531) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #322   +/-   ##
=======================================
  Coverage   85.10%   85.10%           
=======================================
  Files           4        4           
  Lines         282      282           
=======================================
  Hits          240      240           
  Misses         42       42           

Files	Coverage Δ
src/functions.sh	84.39% <100.00%> (ø)