MANWS-4842 MANWS-5159: Remove callHandler which is only used for callback properties (while clearableInput is a boolean)

Author: Thomas Kiendl

src/DateTime.js

@@ -617,9 +617,7 @@ export default class Datetime extends React.Component {
 		});
 	}
 
-	_onInputClear = e => {
-		if ( !this.callHandler( this.props.inputProps.clearableInput, e ) ) return;
-
+	_onInputClear = () => {
 		let clear = {
 			inputValue: '',
 			selectedDate: undefined