qt: fix pip player can not be dragged properly within the browse page

This fixes pip player can not be dragged properly within the browse page. Similar to 9b86a3b4.

This was meant to be included in !6670 (merged), but I did not realize that Browse page has an additional Flickable...

Request review @chub.

This also disables dragging the flickable with mouse (not with touch), which is not an intended behavior for a desktop application.

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added 96 commits

• 69a1d9f6...bf5e2572 - 95 commits from branch videolan:master
• 4847ee6e - qml: disable filtering child mouse events in Browse page flickable

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merged