Remove extraneous ':', modifications to PYTHONPATH

Ran into the following issue:

./group_fixup.py:1:0: F0001: No module named :./group_fixup.py (fatal)

Author: brianhlin

.github/workflows/python-linters.yml

@@ -11,7 +11,7 @@ jobs:
     - uses: actions/checkout@v2
     - id: python-files
       run: |
-        echo "filelist=:$(find . -type f -exec awk ' /^#!.*python/{print FILENAME} {nextfile}' {} + | tr '\n' ' ')" >> $GITHUB_OUTPUT
+        echo "filelist=$(find . -type f -exec awk ' /^#!.*python/{print FILENAME} {nextfile}' {} + | tr '\n' ' ')" >> $GITHUB_OUTPUT
 
   pylint:
     runs-on: ubuntu-20.04
@@ -69,5 +69,4 @@ jobs:
       env:
         PYTHON_FILES: ${{ needs.python-files.outputs.filelist }}
       run: | # Change PYTHONPATH for different repo
-        export PYTHONPATH=$PYTHONPATH:$PWD/src/scripts
         flake8 --select F $PYTHON_FILES