fix: input filter loses focus after edit+filtering with enableExcelCopyBuffer

[ghiscoding]

• some changes made in PR fix: Edit cell mouseout should save & excel copy buffer should still work #917 caused a small issue but only when enableExcelCopyBuffer is set, which only happen after these 2 steps
  1. click on a cell to open an editor
  2. focus on a filter then start typing, the filter will lose focus because it was sent to the grid
• the issue can be reproduced in Slickgrid-Universal Example 13 (or Angular-Slickgrid Example 3 as shown below)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (af9f5db) to head (2ce89f5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1750     +/-   ##
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- Coverage    99.8%   99.8%   -0.0%     
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  Files         187     187             
  Lines       31123   31119      -4     
  Branches     9781    9780      -1     
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- Hits        31034   31030      -4     
  Misses         89      89             

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