Format shell scripts using shfmt

This updates shell scripts to use a consistent style that can be enforced
via pre-commit hook.

As for choosing tabs over spaces, some arguments are:

- tabs can help people with visual impairment
- tabs allow for indenting heredocs in bash
- tabs are the default for the tool shfmt

Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

build/resources/0ad.sh

@@ -1,9 +1,9 @@
 #!/bin/sh
 
-pyrogenesis=$(which pyrogenesis 2> /dev/null)
-if [ -x "$pyrogenesis" ] ; then
-  "$pyrogenesis" "$@"
+pyrogenesis=$(which pyrogenesis 2>/dev/null)
+if [ -x "$pyrogenesis" ]; then
+	"$pyrogenesis" "$@"
 else
-  echo "Error: pyrogenesis not found in ($PATH)"
-  exit 1
+	echo "Error: pyrogenesis not found in ($PATH)"
+	exit 1
 fi