[2430] Rollback case change

These were not the correct tests to be modified. The correct tests to be
modified do not use any hex alphabets currently, and the alphabets are
also generated in the LHS names which are case-insensitive during
comparison.

This will be properly fixed in the next commits on the branch.

src/lib/dns/tests/master_loader_unittest.cc

@@ -558,8 +558,8 @@ TEST_F(MasterLoaderTest, generateWithModifiers) {
     checkRR("b.5.0.0.example.org", RRType::A(), "192.0.2.91");
     checkRR("c.5.0.0.example.org", RRType::A(), "192.0.2.92");
 
-    checkRR("E.5.0.0.example.org", RRType::A(), "192.0.2.94");
-    checkRR("F.5.0.0.example.org", RRType::A(), "192.0.2.95");
+    checkRR("e.5.0.0.example.org", RRType::A(), "192.0.2.94");
+    checkRR("f.5.0.0.example.org", RRType::A(), "192.0.2.95");
     checkRR("0.6.0.0.example.org", RRType::A(), "192.0.2.96");
 
     checkRR("2.6.0.0.0.example.org", RRType::A(), "192.0.2.98");