fix: add hover style to tab within group (#716)

[Zaoei]

Description

Add a tab.hoverBackground variable to control group tabs Floating background color

Fixes # 716

Changes

How Has This Been Tested?

2022-05-25.4.04.11.mov

• add tab.hoverBackground to the thmem configuration file

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #751 (c097e64) into main (05ad264) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
+ Coverage   91.34%   91.38%   +0.04%     
==========================================
  Files         189      189              
  Lines        5947     5952       +5     
  Branches     1426     1428       +2     
==========================================
+ Hits         5432     5439       +7     
+ Misses        508      506       -2     
  Partials        7        7              

Impacted Files	Coverage Δ
src/components/tabs/tab.tsx	100.00% <0.00%> (ø)
src/components/tabs/tabExtra.tsx	100.00% <0.00%> (ø)
src/workbench/sidebar/explore/folderTree.tsx	100.00% <0.00%> (ø)
src/components/tree/index.tsx	98.99% <0.00%> (+0.01%)	⬆️
src/components/breadcrumb/index.tsx	93.33% <0.00%> (+0.47%)	⬆️
src/workbench/editor/action.tsx	89.74% <0.00%> (+5.12%)	⬆️

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[wewoor]

+1