un-escape json chars

fix https://github.com/acmesh-official/acme.sh/issues/2833

acme.sh

@@ -846,6 +846,14 @@ _json_encode() {
   echo "$_j_str" | _hex_dump | _lower_case | sed 's/0a/5c 6e/g' | tr -d ' ' | _h2b | tr -d "\r\n"
 }
 
+#from: http:\/\/  to http://
+_json_decode() {
+  _j_str="$(sed 's#\\/#/#g')"
+  _debug3 "_json_decode"
+  _debug3 "_j_str" "$_j_str"
+  echo "$_j_str"
+}
+
 #options file
 _sed_i() {
   options="$1"
@@ -4019,7 +4027,7 @@ issue() {
       #for dns manual mode
       _savedomainconf "Le_OrderFinalize" "$Le_OrderFinalize"
 
-      _authorizations_seg="$(echo "$response" | _egrep_o '"authorizations" *: *\[[^\[]*\]' | cut -d '[' -f 2 | tr -d ']' | tr -d '"')"
+      _authorizations_seg="$(echo "$response" | _json_decode | _egrep_o '"authorizations" *: *\[[^\[]*\]' | cut -d '[' -f 2 | tr -d ']' | tr -d '"')"
       _debug2 _authorizations_seg "$_authorizations_seg"
       if [ -z "$_authorizations_seg" ]; then
         _err "_authorizations_seg not found."