Clean up misuses of Truth where proposition values are passed into ASSERT.that() instead of the object under test.  This leads to patterns like:

ASSERT.that(myMap.values().isEmpty());

The above will do exactly nothing, because Truth is a fluent API and expects a value and returns an object with custom proposition methods on it, i.e.

ASSERT.that(myMap.values()).isEmpty(); is the appropriate fix.

This is in preparation for an upgrade to Truth which includes @CheckReturnValue on methods like .that() in order to let error-prone flag these as a compile-error.
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