[Date picker] Text input mode: Cursor should be positioned at end of text field

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**Description:** In version 1.9.0, when opening DatePicker with text input mode and a default selection, the cursor was positioned at the end:

Since version 1.10.0 it is positioned at the beginning;

**Expected behavior:** For usability, it is preferable to position cursor at the end, since in order to delete the default selection, user must now change cursor position first.

**Minimal sample app repro:** The issue can be reproduced with the Catalog app -> Date Picker. Set Default Selection to Today, and Input Mode to Text Input.

The problem seems to have been introduced with commit 4032a741127b4715c3bbcd4cab08494b39ae5bdb

**Android API version:** API 32

**Material Library version:** Since 1.10.0

**Device:** Emulator

Reproduce the issue in the Catalog app's Date Picker with Default Selection set to Today and Input Mode set to Text Input. Inspect commit 4032a741127b4715c3bbcd4cab08494b39ae5bdb and the related date-picker code. Done means the cursor is positioned at the end of the preselected text, matching the behavior in version 1.9.0.

Written by the indexing model from the issue text.