fix: action typings

[xMartin]

The ActionContext type takes two types as arguments: the module state
and the root state. In the counter example module we passed the state
twice instead which still works as we are not using the root state.

What is accomplished by your PR?

Fix typings for actions to prevent running into typing issues as soon as you are using the root state.

Is there something controversial in your PR?

Not if I got it right.

Checklist

New Feature / Bug Fix

• Run unit tests to ensure all existing tests are still passing
• Add new passing unit tests to cover the code introduced by your PR
• Add new documentation for the code introduced by your PR

[codecov]

Codecov Report

Merging #262 into next will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff         @@
##           next   #262   +/-   ##
===================================
  Coverage   100%   100%           
===================================
  Files        64     64           
  Lines      1264   1264           
  Branches    171    171           
===================================
  Hits       1264   1264

Impacted Files	Coverage Δ
src/app/counter/actions.ts	100% <100%> (ø)	⬆️

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[devCrossNet]

LGTM 👍