fix: create dpr srcset when only h passed in as param

[luqven]

Description

This PR ensures a DPR-based SrcSet is generated when a fixed height is the only parameter value.

• It removes tests that no longer apply to only having h as a param, and
• adds tests that ensure the DPR sercset was generated correctly.

Up for discussion

This PR also introduces some build changes that were necessary to bring the Java comparability up to speed with MacOs BigSur development.

[commit-lint[bot]]

Bug Fixes

• change dpr srcset logic and add tests (25c9f68)

Tests

• change height drp test to match established pattern (14bcbd0)
• add testHeightIncludesDPRParam (299410f)

Chore

• add param value check to test (e980d95)
• undo variable declaration change (23a5d7d)
• update urlbuilder commnets (110121c)
• revert build gradle change to travis compat (1007346)

Contributors

luqven

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