Modernize ui-helper-hidden-accessible

[melloware]

Based on this https://stackoverflow.com/a/62109988/502366

This jQuery style for screenreaders has not changed in a long time but now that browser have advanced it is missing some features explained in the stack overflow.

.ui-helper-hidden-accessible {
        position: absolute;
	pointer-events: none;
        opacity: 0;
	white-space: nowrap;  /* added line to stop words getting smushed together (as they go onto seperate lines and some screen readers do not understand line feeds as a space */
}

[linux-foundation-easycla[bot]]

• :x: - login: @melloware / name: Melloware . The commit (447a89c114552c503245d43f16093c5970dbb2d6, 709f7ac11bb4874b17015630f1effa6678064570, 50b5e2802a180f6ae9ad9ae0219471f711ffd32a, 674445cd7789bb756c68fcc63fc31d930ef273a6) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[melloware]

Just putting this here for others...