Merge pull request #3516 from LocutusOfBorg/no-shebang-1.1-maint

borg shell completion: remove shebang, useless because scripts are sourced

scripts/shell_completions/bash/borg

@@ -1,5 +1,3 @@
-#!/bin/bash
-
 # Completions for borg
 # https://www.borgbackup.org/
 # Note: