ITS: use openCV adaptive threshold if no circle found

Details: certain captures have a large area of similar intensity around
the circle, and openCV cannot find the circle contour in the scene.
Changed behavior to use adaptive thresholding if the circle cannot be
found with global thresholding.

Bug: 292022788
Test: tested by partner
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:71535bf9ea971a04331daa822691f37bd5053e12)
Merged-In: I2b05e18724e858e5eb4c6d062052de41ab3479be
Change-Id: I2b05e18724e858e5eb4c6d062052de41ab3479be