Update rounding logic for results page

[DanielRyanSmith]

Fixes #4107

The test results page was handling score rounding slightly differently than the interop dashboard (rounding to the nearest whole percent rather than nearest tenth of a percent). In order to avoid rounding up to 100% in cases where there were still some tests/subtests failing, some logic was added to instead display the score as 99.9% in those cases. This created a situation in which the interop dashboard and the results page looked close enough to each other (99.7% vs. 99.9%) that it seemed as if there was a calculation error on one of the pages. I hadn't looked at this logic in some time and also assumed this was some calculation error. 😅

This very simple change makes it so the results page rounds the score in the same way as the interop dashboard, so this confusion will not come up again.

Before

After

[jcscottiii]

LGTM. A possible improvement would be to have a tooltip or alternative text that is initially hidden. When triggered (on hover or something else), it shows the precise number.