[DocumentsUITests]FileManagementUiTest#testCopyLargeAmountOfFiles Fail

Action will not be performed because the target view does not match
at least 90 percent of the view's area is displayed to the user.
Root Cause:
  - dropdown_sort_widget height : 60dp
  - Button height : 48dp
  - 48dp/60dp = 80%
HierarchyView :
    dropdown_sort_widget height : 210
    sort_dimen_dropdown : 168
    168/210 = 80%

Solution:
    Adjust dropdown_sort_widget_size from 48dp to 54dp
    Then 54/60 = 90%

Bug: 112064049
Test: atest DocumentsUITests:FileManagementUiTest#testCopyLargeAmountOfFiles
Change-Id: I915099a516650b6f3b7f4fae357156901f867955