Fix not being able to type in code cell after switching from text (#1…

[chlafreniere]

…7590)

• Fix not being able to type in code cell after switching from text

This PR fixes #17579

Note: this hasn't been approved for release yet, opportunistically opening this if/when it's approved.

[coveralls]

Pull Request Test Coverage Report for Build 1419636153

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.002%) to 41.509%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/sql/workbench/contrib/notebook/browser/cellViews/textCell.component.ts	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/sql/workbench/services/connection/browser/connectionDialogWidget.ts	1	75.1%

Totals
Change from base Build 1414212838:	0.002%
Covered Lines:	26840
Relevant Lines:	58674

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💛 - Coveralls