fix(store-devtools): escaping the safelist and blocklist strings

[evgenyfedorenko]

Closes #2228

PR Checklist

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• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #2228

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[ngrxbot]

Preview docs changes for 65b785a at https://previews.ngrx.io/pr2259-65b785a/

[timdeschryver]

I believe this won't work if multiple action types are added to the safe or block list.

[evgenyfedorenko]

I believe this won't work if multiple action types are added to the safe or block list.

Good catch. Added a fix for a fix.