Add "fflib_" prefix to primitive domain test classes

sfdx-source/apex-extensions/tests/classes/domains/fflib_PrimitiveDomainsTest.cls

@@ -29,7 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 @IsTest(IsParallel=true)
-private class PrimitiveDomainsTest
+private class fflib_PrimitiveDomainsTest
 {
     @IsTest
     static void testDates()

sfdx-source/apex-extensions/tests/classes/domains/fflib_SObjects2Test.cls

@@ -29,7 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 @IsTest(IsParallel=true)
-private class SObjectsTest
+private class fflib_SObjects2Test
 {
 	@IsTest
 	static void itShouldAddErrorMessage()