BinaryTransparencyService: Set DEBUG flag to false.

A DEBUG flag was introduced prior to guard some of the more
verbose and noisy logging methods.

Now that the development is largely done, we are ready to set this
flag to be false for production.

Bug: 259493439
Test: Manual. atest BinaryTransparencyServiceTest.
Change-Id: I975d17776473532c86b0395efcc2e3862a65dac0
1 file changed