fix: resolve readability-redundant-string-init warning

Author: kwvg

src/stats/client.cpp

@@ -81,9 +81,9 @@ class StatsdClientImpl final : public StatsdClient
     std::unique_ptr<RawSender> m_sender{nullptr};
 
     /* Phrase prepended to keys */
-    const std::string m_prefix{""};
+    const std::string m_prefix{};
     /* Phrase appended to keys */
-    const std::string m_suffix{""};
+    const std::string m_suffix{};
 };
 } // anonymous namespace