issue327: * reset time to placeholders if user cuts selected value

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 :tada:

Comparison is base (f39ed7e) 95.67% compared to head (41a9332) 95.68%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #447 +/- ## ========================================== + Coverage 95.67% 95.68% +0.01% ========================================== Files 40 40 Lines 810 812 +2 Branches 190 191 +1 ========================================== + Hits 775 777 +2 Misses 15 15 Partials 20 20 ``` | [Impacted Files](https://app.codecov.io/gh/Agranom/ngx-material-timepicker/pull/447?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Vitalii) | Coverage Δ | | |---|---|---| | [...e-control/ngx-timepicker-time-control.component.ts](https://app.codecov.io/gh/Agranom/ngx-material-timepicker/pull/447?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Vitalii#diff-c3JjL2FwcC9tYXRlcmlhbC10aW1lcGlja2VyL2NvbXBvbmVudHMvdGltZXBpY2tlci1maWVsZC90aW1lcGlja2VyLXRpbWUtY29udHJvbC9uZ3gtdGltZXBpY2tlci10aW1lLWNvbnRyb2wuY29tcG9uZW50LnRz) | `96.05% <100.00%> (+0.10%)` | :arrow_up: |

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