[Bug] sending unsigned vp to verifier in example code

## Bug description
On creating vp example code, the verifier should receive the signed vp rather than the unsigned vp

## Language version
- Language: TS
- Version:

## IOTA Identity version
- Version (version number, commit, or branch): 1.5.0

## Steps To reproduce the bug
1. run the TS based example code to create and validate vp
2. existing code is sending the unsigned vp rather than the signed vp in jwt format

## Expected behaviour
the holder should send the signed vp in jwt format

## Actual behaviour
the holder sending unsigned vp