[2.1] generateClearAll from fe_page to fe_

[zonky2]

see

core/src/MetaModels/FrontendIntegration/FrontendFilter.php

Line 420 in ad6c69b

if (substr($strTemplate, 0, 7) === 'fe_page') {

I think, we can change to fe_
see https://github.com/contao/contao/blob/53f0ac3393c997999c7619fe0c2865137f673c5b/core-bundle/src/Resources/contao/dca/tl_layout.php#L564

and we ar compatible to bundle contao-bootstrap