Reformat shell scripts with shfmt

All changes in this commit were automated using the command:

  shfmt -w -i 2 -ci -bn . $(find . -name "*.sh.in")

By default, only *.sh and files without extension are checked, so
*.sh.in files have to be added additionally. (See mvdan/sh#944)

bin/tests/system/multisigner/setup.sh

@@ -23,14 +23,14 @@ copy_setports ns4/named.conf.in ns4/named.conf
 copy_setports ns5/named.conf.in ns5/named.conf
 
 (
-	cd ns3
-	$SHELL setup.sh
+  cd ns3
+  $SHELL setup.sh
 )
 (
-	cd ns4
-	$SHELL setup.sh
+  cd ns4
+  $SHELL setup.sh
 )
 (
-	cd ns5
-	$SHELL setup.sh
+  cd ns5
+  $SHELL setup.sh
 )