fix: consider all delegation strategies

[ChaituVR]

Summary

Related to https://github.com/snapshot-labs/workflow/issues/306

• Previously we consider only first delegation strategy, this is resulting in wrong voting power in delegates page

How to test

1. Go to https://snapshot.org/#/delegate/sandboxdao.eth
2. you will see vp of first delegation strategy
3. After the fix, you will see voting power of all delegation strategies

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src/views/DelegateView.vue:175

• Ensure that the new logic of summing up scores from all delegation strategies is covered by tests.

scores.forEach(delegationScore => {