GATT: Fix usage of 16 and 32 bit UUID's in Discover services by UUID

Fix improper usage of 16 and 32 bit UUID's in Disocever services by UUID
Fixes PTS test cases GATT/CL/GAD/BV-08-C and GATT/CL/GAR/BV-03-C.

Test: PTS test cases GATT/CL/GAD/BV-08-C and GATT/CL/GAR/BV-03-C passes

Bug: 80095184
Change-Id: Ia0a26bd20ee68c5c7db0bc00036634f6719f25e9