Tools: Small housekeeping

- Make generate_redump_yaml.py executable and fix the trailing whitespace
- Fix shebang for retry.sh

tools/generate_redump_yaml.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3 
+#!/usr/bin/env python3
 
 import sys
 import xml.etree.ElementTree as ET

tools/retry.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 RETRIES=10