Fix traceback in atomic_move (#18649)

Commit 8b08a28c89 removed a
call to get_exception() that was needed. Without it, the fail_json
references an undefined variable ('exception') and throws an exception.

Add the get_exception() back in where needed and update references.

Now the proper module failure is returned.

Fixes #18628

lib/ansible/module_utils/basic.py

@@ -2086,12 +2086,14 @@ class AnsibleModule(object):
                         try:
                             os.rename(b_tmp_dest_name, b_dest)
                         except (shutil.Error, OSError, IOError):
+                            e = get_exception()
                             if unsafe_writes:
-                                self._unsafe_writes(b_tmp_dest_name, b_dest, get_exception())
+                                self._unsafe_writes(b_tmp_dest_name, b_dest, e)
                             else:
-                                self.fail_json(msg='Could not replace file: %s to %s: %s' % (src, dest, exception))
+                                self.fail_json(msg='Could not replace file: %s to %s: %s' % (src, dest, e))
                     except (shutil.Error, OSError, IOError):
-                        self.fail_json(msg='Could not replace file: %s to %s: %s' % (src, dest, exception))
+                        e = get_exception()
+                        self.fail_json(msg='Could not replace file: %s to %s: %s' % (src, dest, e))
                 finally:
                     self.cleanup(b_tmp_dest_name)