Modifies error message when making Hub requests

Making the debug msg more clear since it could be useful in cases where
something goes wrong in making requests to the Context Hub. While things
will be refactored later, but this is a simple change that could save
some debug time in the meantime.

Bug: 67734082
Test: Compile only
Change-Id: I155b135a1d52f9402db41659740cabb936a1da0d