Fixed bug in which a body running only atmesc did not lose water if d…

[RoryBarnes]

…FXUV was set.

Added new tests for water loss from constant XUV flux

Proposed changes

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• Bugfix (non-breaking change that fixes an issue)
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[github-actions]

Test Results

18 952 tests   18 922 ✅  3m 31s ⏱️
     1 suites       0 💤
     1 files        30 ❌

For more details on these failures, see this check.

Results for commit 4507311.

[github-actions]

Test Results

18 952 tests   18 922 ✅  3m 44s ⏱️
     1 suites       0 💤
     1 files        30 ❌

For more details on these failures, see this check.

Results for commit 4507311.

♻️ This comment has been updated with latest results.