fix(schematics): fix effects code generated by schematics:feature

[krzysztof-grzybek]

Variables names in Effects should be consistent across whole file.

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)
• Docs have 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?

Issue Number: #1356

What is the new behavior?

ng generate @ngrx/schematics:feature customName generates Effects code correctly.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[coveralls]

Coverage remained the same at 88.4% when pulling 9f5dc15 on krzysztof-grzybek:schematics-effects-foo-fix into 41a0d45 on ngrx:master.

[timdeschryver]

LGTM.

[brandonroberts]

Thanks @krzysztof-grzybek!