Fix blacklist add script (works only on latest yacy docker)

blacklist-add.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 add_entry ()
 {
@@ -24,14 +24,14 @@ add_entry_domainandsub ()
 	add_entry '*.'$1'/.*'
 }
 
-if [ "$1" == '' ]; then
+if [[ $1 == '' ]]; then
 	echo 'E| you must specify the domain to add'
 	exit 1
 fi
 
-if [ "$2" == 0 ]; then
+if [[ $2 == 0 ]]; then
 	add_entry_domainonly $1
-elif [ "$2" == 1 ]; then
+elif [[ $2 == 1 ]]; then
 	add_entry_domainandsub $1
 else
 	echo 'E| second parameter must be one of [ 0 | 1 ]'