Date picker applies non-date mask when dropdown mode is set after init

[damyanpetev]

Description

When the mode option is changed to dropdown after control init, the picker applies a mask that's not a date (the igxMask default)

• igniteui-angular version: 9.0.x
• browser: N/A

Steps to reproduce

1. Open https://stackblitz.com/edit/datepicker-mode-switch
2. Change the mode from the select
3. Focus the input

Result

The editor displays the date correctly as "5/15/19", but when you focus there's no value and the placeholder shows the underlying mask as "CCCCCCC..":

Also if you clear the editor and focus again, the picker throws a parsing error:

Expected result

The editor should work the same as if mode="dropdown" has been assigned intially, formatting the date as "_5/15/2019" when focused and display an empty mask (__/__/____) for cleared.

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[jackofdiamond5]

The issue will be tackled in #6483

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