Modify function signature for unit test.

sdbusplus changed the function signature of
sd_bus_emit_properties_changed_strv. Modify unit test according.

Signed-off-by: Hao Jiang <jianghao@google.com>
Change-Id: I372543425db822ad4c8c48b5f93a72f291d69d11
diff --git a/test/pid_zone_unittest.cpp b/test/pid_zone_unittest.cpp
index 97b7f10..08f22d1 100644
--- a/test/pid_zone_unittest.cpp
+++ b/test/pid_zone_unittest.cpp
@@ -526,7 +526,7 @@
                 sd_bus_emit_properties_changed_strv(
                     IsNull(), StrEq(objPath), StrEq(modeInterface), NotNull()))
         .WillOnce(Invoke([&](sd_bus* bus, const char* path,
-                             const char* interface, char** names) {
+                             const char* interface, const char** names) {
             EXPECT_STREQ("Manual", names[0]);
             return 0;
         }));