Tweak search radius value to take into account Qt6's change from physical to logical DPI #4493
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When we migrated to Qt6, we had to change our map canvas DPI from physical to logical DPI here (https://github.com/opengisch/QField/blob/master/src/core/qgsquick/qgsquickmapcanvasmap.cpp#L283). It resulted in a smaller search area on Android, which makes it quite hard to hit points.
The PR adjusts the value to be friendlier on highdpi screens using Qt6.