fix(PermissionOverwrites): throw better error if resolving option fails

[SpaceEEC]

Please describe the changes this PR makes and why it should be merged:

This PR fixes a bug that causes invalid permission flags to be reported back as undefined
e.g.

channel.permissionOverwrites.edit(role, {
    FOO_BAR: true,
});

Would throw this error: RangeError [BITFIELD_INVALID]: Invalid bitfield flag or number: undefined.

With this PR it will throw: RangeError [BITFIELD_INVALID]: Invalid bitfield flag or number: FOO_BAR.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating