The PRELOAD variable in wasm_shell.html wouldn't get substituted with
preload list when using qmake. Do that as it is done in cmake.
Fixes: QTBUG-115507
Change-Id: I3c659626dc6fa6f4fdf9e31bd62b87fc6a7d8bbe
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>