Time Constraint - Add delete option

[ChrSchuettler]

When specifying the time restriction in the pop-up window, enable input to be reset/deleted

[juliangruendner]

@Shayan1375 - extend to add reset button to all attributes

[Shayan1375]

Please review the placement of the Reset button after adding it to the options "Entnahmeort" and "Time constraint," as shown in the picture below. Alternative placements could include the left corner or the top right corner.
@kleinertp @mgebhardttmf @juliangruendner

[juliangruendner]

@Shayan1375 reset should be placed in top right corner and also appear when attribute is closed, see screenshot below:

also double check that it is only disabled if there is nothing to reset.