Use workflow ID instead of workflow name in queries

[kinow]

These changes close #422

We have the user (same from the URL) that is pre-fetched in the Route's. So this PR is simply using that user.username to use as parameter in the query, instead of using the workflow name.

This is necessary for #420 , as there the deltas use the workflow ID, not the name.

Further work to support URL's with other user's username is part of another issue 👍

Requirements check-list

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Already covered by existing tests.
• No change log entry required (why? e.g. invisible to users).
• No documentation update required.

[codecov-io]

Codecov Report

Merging #433 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #433   +/-   ##
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  Coverage   44.62%   44.62%           
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  Files          37       37           
  Lines         856      856           
  Branches       67       67           
=======================================
  Hits          382      382           
  Misses        461      461           
  Partials       13       13           

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[kinow]

An easy way to review, is going through graph/$workflow, tree/$workflow, and workflow/$workflow, and looking at the debug log in the browser console. The query must use the workflow ID.