Downgrade Electron to 1.7.3 with debug fix

This reverts commit e16484a3.

* Editor model creation options do not honour folder scope yet (fixes #29119)

* fix tests

Move to Electron 1.7.3

Fixes #33048

* Fix onDiChangeTextEditorSelection firing when the editor is resized

**Bug**
onDidChangeTextEditorSelection is being fired when the editor window is resized

**Fix**
Make sure we do not refire this event if the selection in terms of the model has not changed

Fixes #32092

* Fix null deref

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