Use case-insensitive endsWith() instead of lowering a QString and then
comparing case-sensitively.
As a drive-by, replace ascii string literal with char16_t one.
Change-Id: Id4d8e5b197baba7aa3ae4c2ae57414c1242b3827
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>