Recombination workflow link needs fixing

[wm75]

The link in
https://github.com/galaxyproject/SARS-CoV-2/blob/master/Recombination/README.md#history-and-workflow

points to a history instead of to a workflow.

[wm75]

To elaborate a bit here:

1. the history link in that section points to the wrong history (the one for the comparison workflow)
2. the workflow link points to the history that describes the intended analysis, but it's on test.galaxyproject, not Main

[nekrut]

this is now fixed