Camera: Handle interaction between ZoomRatioMapper and zoom override

When figuring out the zoomRatio set by the application for a particular
capture, we should't use the frameNumber for the corresponding request.
Use the frameNumber of the newer request overriding the current request
instead.

Test: Camera CTS
Bug: 239822823
Change-Id: Ie8973698ec68608ddc4be9ed4d2ed2d06b9da268