Change keyboard shortcut for execSelectionInTerminal to Shift+Enter

[DonJayamanne]

Fixes #1875

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[d3r3kk]

👍

[codecov]

Codecov Report

Merging #1961 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1961      +/-   ##
==========================================
+ Coverage   74.51%   74.53%   +0.01%     
==========================================
  Files         285      285              
  Lines       13359    13359              
  Branches     2390     2390              
==========================================
+ Hits         9955     9957       +2     
+ Misses       3268     3265       -3     
- Partials      136      137       +1

Impacted Files	Coverage Δ
src/client/debugger/PythonProcess.ts	45.83% <0%> (-2.09%)	⬇️
...rc/client/debugger/PythonProcessCallbackHandler.ts	54.27% <0%> (+0.65%)	⬆️
src/client/debugger/mainV2.ts	80.72% <0%> (+2%)	⬆️

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