*: 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

.config/rofi/rofi-wifi-menu.sh

@@ -13,7 +13,7 @@ XOFF=0
 FONT="DejaVu Sans Mono 8"
 
 # if [ -r "$DIR/config" ]; then
-#     source "$DIR/config"
+# 	source "$DIR/config"
 # elif [ -r "$HOME/.config/rofi/wifi" ]; then
 # 	source "$HOME/.config/rofi/wifi"
 # else