software/metabase: fix backup restoration

use dropdb and createdb command is a working approach to backup
restoration here

software/metabase/buildout.hash.cfg

 [instance-profile]
 filename = instance.cfg.in
-md5sum = 0e74c862401f266111552b7a3611f7bf
+md5sum = 685e7b371768f6977896d7214fd379f1

software/metabase/instance.cfg.in

@@ -130,7 +130,7 @@ recipe = slapos.cookbook:generate.password
 
 [postgresql]
 recipe = slapos.cookbook:postgres
-bin = ${postgresql10:location}/bin/
+bin = ${postgresql10:location}/bin
 services = $${directory:service}
 dbname  = metabase_db
 superuser = metabase-psql
@@ -190,7 +190,16 @@ wrapper-path = $${directory:bin}/$${:_buildout_section_name_}
 command-line =
   sh -e -c "\
     echo 'This will replace current database with latest backup. Hit Ctrl+C to cancel';
-    sleep 30;
+    sleep 10;
+    $${postgresql:bin}/dropdb \
+        -h $${postgresql:pgdata-directory} \
+        -U $${postgresql:superuser} \
+        --if-exists \
+        $${postgresql:dbname};
+    $${postgresql:bin}/createdb \
+        -h $${postgresql:pgdata-directory} \
+        -U $${postgresql:superuser} \
+        $${postgresql:dbname};
     $${postgresql:bin}/pg_restore \
         --exit-on-error \
         -h $${postgresql:pgdata-directory} \