» Thunderbird/Enigmail: fix quoting

At some point Thunderbird/Enigmail started quoting using "|" instead of the standard ">". Finally bothered to find a way to fix this! When you have the about:config extension, read this thread on the enigmail forum. When not, do it by directly editing Thunderbird's prefs.js:

for f in ~/.thunderbird/*/prefs.js; do echo 'user_pref("mailnews.send_plaintext_flowed", false);' >>"$f"; done