Fix permission overwrites by sending Discord the correct overwrite types (#1546)

Closes #1504

Author: woongzeyi

src/builder/create_channel.rs

@@ -130,8 +130,8 @@ impl CreateChannel {
             .into_iter()
             .map(|perm| {
                 let (id, kind) = match perm.kind {
-                    PermissionOverwriteType::Member(id) => (id.0, "member"),
-                    PermissionOverwriteType::Role(id) => (id.0, "role"),
+                    PermissionOverwriteType::Role(id) => (id.0, 0),
+                    PermissionOverwriteType::Member(id) => (id.0, 1),
                 };
 
                 json!({