Test: Reenable HydraDX chopsticks tests

[bvotteler]

Resolves #138

Changes:

• Reenable HydraDX chopsticks tests
• Modify ED check for HydraDX only to bump minimal amount's fees by 10%

The second part is to avoid issues where fees required change due to previous test transactions since HydraDX uses the token/HDX pair for fees which can slip and lead to false negatives.

This bump by an arbitrary percentage (10%) isn't perfect, but would at least catch some cases where the ED changes by a value that's in excess of actual fees plus 10%.
Given our fee estimate is 10x and tests start failing when the estimate is less than 2x the actual fee, the minimum amount returned by the XCM bridge should still be large enough to cover small changes in ED not caught.

[sander2]

I agree with your assessment. Not ideal, but good enough to catch problems as long as we maintain the 2x safety margin