*: Use tabs for indentation where appropriate

I am a big supporter of the approach to indent with tabs and align with
spaces. (Read [here][1] f.e.) Thus at some places a simple `s/ {4}/\t/g`
(replace 4 with whatever fits) is not enough and a bit more thought is
needed. Because of that there are still places where I plan to
substitute the whitespace in the future.

This patch contains exclusively whitespace changes. Check for yourself
with `git diff --ignore-all-space`.

[1]: https://dmitryfrank.com/articles/indent_with_tabs_align_with_spaces

.local/bin/wifi-mute

@@ -4,7 +4,7 @@
 # ('*/5 *   * * * /usr/local/bin/wifi-mute')
 
 if [[ "$(nmcli -t -f name con show --active)" =~ eduroam* ]]; then # iwgetid -r
-    # TODO: mute only speaker, not headphones
-    amixer set Master mute
+	# TODO: mute only speaker, not headphones
+	amixer set Master mute
 fi