fix(StoreDevTools): out of bounds when actions are filtered

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• 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 #1522

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

The same error in the issue occured while using the blacklist or whitelist option.

[coveralls]

Coverage increased (+0.5%) to 89.281% when pulling 3d3f6f0 on pr/devtools-ignore-actions into 48a2370 on master.

[ngrxbot]

Preview docs changes for 5fef5be at https://previews.ngrx.io/pr1532-5fef5be/

[ngrxbot]

Preview docs changes for 3d3f6f0 at https://previews.ngrx.io/pr1532-3d3f6f0/