strip indentation in `not` quickpick

[zardoy]

Before:

After:

[codecov[bot]]

Codecov Report

Base: 98.08% // Head: 98.08% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (ecacb6a) compared to base (c4a5857). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #84 +/- ## ======================================== Coverage 98.08% 98.08% ======================================== Files 21 21 Lines 1150 1151 +1 Branches 210 210 ======================================== + Hits 1128 1129 +1 Misses 21 21 Partials 1 1 ``` | [Impacted Files](https://codecov.io/gh/ipatalas/vscode-postfix-ts/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ireneusz+Patalas) | Coverage Δ | | |---|---|---| | [src/notCommand.ts](https://codecov.io/gh/ipatalas/vscode-postfix-ts/pull/84/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ireneusz+Patalas#diff-c3JjL25vdENvbW1hbmQudHM=) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ireneusz+Patalas). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ireneusz+Patalas)

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