MSMF: fixed issue with camera format selection

[mshabunin]

resolves #16711

Default resolution for camera is set to 640x480, if camera supports only greater resolutions, the detection process fails to select them because starting value of 0x0 is considered closer to 640x480 than to e.g. 1920x960.

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• I agree to contribute to the project under OpenCV (BSD) License.
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  Patch to opencv_extra has the same branch name.
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[alalek]

Thank you!