Fix missing useCustomTheme type in Picker (wix#2235)

Author: ethanshar

src/components/picker/types.tsx

@@ -48,7 +48,7 @@ export interface PickerSearchStyle {
 
 // TODO: need to extend TextField props (and not just TextInputProps)
 export type PickerBaseProps = Omit<TextFieldProps, 'value' | 'onChange'> &
-  Omit<NewTextFieldProps, 'value' | 'onChange'> & {
+  Omit<NewTextFieldProps, 'value' | 'onChange'> & ThemeComponent & {
     /* ...TextField.propTypes, */
     /**
      * Temporary prop required for migration to Picker's new API