Remove "+" and "-" from formattedItem.countdown in ExpandedViewItem.vue

[charlesh88]

Closes #8171

Describe your changes:

• Added { skipPrefix: true } to the format() call for the Time List's Expanded view countdown "hero" item.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [] Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins?

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.71%. Comparing base (2494e2f) to head (1d968b7).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/plugins/timelist/ExpandedViewItem.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8172      +/-   ##
==========================================
- Coverage   57.16%   56.71%   -0.46%     
==========================================
  Files         704      704              
  Lines       28283    28283              
  Branches     2770     2770              
==========================================
- Hits        16169    16040     -129     
- Misses      11768    11899     +131     
+ Partials      346      344       -2     

Flag	Coverage Δ
e2e-ci	63.17% <ø> (+0.02%)	⬆️
e2e-full	23.68% <ø> (-18.72%)	⬇️
unit	48.37% <0.00%> (+0.04%)	⬆️

Files with missing lines	Coverage Δ
src/plugins/timelist/ExpandedViewItem.vue	5.76% <0.00%> (ø)

... and 10 files with indirect coverage changes

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