Give position-area-inline-container.html and position-area-abs-inline-container.html `line-height:1` to align with Ahem best-practices

[dholbert]

Test List

https://wpt.fyi/results/css/css-anchor-position/position-area-abs-inline-container.html
https://wpt.fyi/results/css/css-anchor-position/position-area-inline-container.html

Rationale

Currently, these tests use the Ahem font without declaring a line-height, which goes against Ahem best-practices as documented on https://web-platform-tests.org/writing-tests/ahem.html :
"An explicit (i.e., not normal) line-height should also always be used"

(...because the behavior of the default line-height:normal isn't precisely specified, and it varies between browsers.)

Other tests in the same directory all properly specify a line-height - these are the only two that lack one, I think.

[dholbert]

@bfgeek @gsnedders sorry to bother you again -- this is another trivial test-tweak to avoid an inadvertent over-dependency on something -- mind signing off on this?

[dholbert]

PR at web-platform-tests/wpt#56802 to fix this.

As noted over there, I think test-results should show up here at some point soon, maybe in a couple hours:
https://wpt.fyi/results/css/css-anchor-position?sha=2e329beba0&label=pr_head&max-count=1

(Based on those results & my local testing, adding line-height:1 fixes Firefox's failures in both tests.)

[dholbert]

PR at web-platform-tests/wpt#56802 to fix this.

@nt1m approved the PR over in the WPT repo - thanks Tim!

I'll wait to merge until getting a thumbs-up from a Chromium person, to be sure I'm following procedure.

As noted over there, I think test-results should show up here at some point soon, maybe in a couple hours:
https://wpt.fyi/results/css/css-anchor-position?sha=2e329beba0&label=pr_head&max-count=1

(Test results came back; passing everywhere, as-expected. \o/)

[bfgeek]

Lgtm