Set is_private default value false

Signed-off-by: Ko Nagase <[email protected]>

Author: sanak

app/controllers/smash_tags_controller.rb

@@ -173,6 +173,7 @@ def build_tags
             {
               key: "is_private",
               label: l(:field_is_private),
+              value: "false",
               type: "boolean",
               mandatory: "yes"
             }