fix(datepicker): infinity loop

[mlmoravek]

Fixed datepicker infinity loop.

Fixes #624

Proposed Changes

• fix changeFocus method
• refactor focusedDate to prod binding

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (860d083) 63.48% compared to head (40c4065) 63.39%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #625      +/-   ##
===========================================
- Coverage    63.48%   63.39%   -0.10%     
===========================================
  Files           86       86              
  Lines         5532     5532              
  Branches      1566     1566              
===========================================
- Hits          3512     3507       -5     
- Misses        1909     1914       +5     
  Partials       111      111              

Flag	Coverage Δ
oruga	65.92% <ø> (ø)
oruga-next	51.99% <ø> (-0.50%)	⬇️

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see 2 files with indirect coverage changes

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