fix(hack): format every shell script in hack

format.sh ran shfmt on hack/**/*.sh without enabling globstar, so ** only
matched a single directory. Scripts directly in hack and in deeper
directories like hack/dev/kernel were never formatted.

hack/format.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 set -e
+# Without globstar, ** matches like *, so only scripts one directory deep are formatted.
+shopt -s globstar
 
 cd "$(dirname "${0}")/.." || exit 1