Fix lint script shebang, args, and nix env checks (#2167)

* Fix lint script shebang, args, and nix env checks

* Update lint.sh: fix lint issues

* Update lint.sh

Fix linting issue

---------

Co-authored-by: Disconnect3d <dominik.b.czarnota@gmail.com>

lint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -o errexit
 
@@ -16,7 +16,7 @@ FIX=0
 
 while [[ $# -gt 0 ]]; do
     case $1 in
-        -f | --format)
+        -f | --fix)
             FIX=1
             shift
             ;;
@@ -31,7 +31,9 @@ if [[ -z "${PWNDBG_VENV_PATH}" ]]; then
     PWNDBG_VENV_PATH="./.venv"
 fi
 
-source "${PWNDBG_VENV_PATH}/bin/activate"
+if [[ "${PWNDBG_VENV_PATH}" != "PWNDBG_PLEASE_SKIP_VENV" ]]; then
+    source "${PWNDBG_VENV_PATH}/bin/activate"
+fi
 
 set -o xtrace