[FAB-12626] Fix couchdb_test.go debug

Lowercase "debug" so that verbose (-v)  testing
logs at debug level.

Change-Id: I71360e273dc85002a6ff4f83e695b1adb9ddb70e
Signed-off-by: David Enyeart <enyeart@us.ibm.com>

Author: denyeart

core/ledger/util/couchdb/couchdb_test.go

@@ -82,7 +82,7 @@ func testMain(m *testing.M) int {
 	viper.Set("ledger.state.couchDBConfig.createGlobalChangesDB", true)
 
 	//set the logging level to DEBUG to test debug only code
-	flogging.SetModuleLevel("couchdb", "Debug")
+	flogging.SetModuleLevel("couchdb", "debug")
 
 	viper.Set("logging.peer", "debug")