fix invalid string cast

core/string/ustring.h

@@ -523,10 +523,10 @@ String DTRN(const String &p_text, const String &p_text_plural, int p_n, const St
 #define TTRGET(m_value) TTR(m_value)
 
 #else
-#define TTR(m_value) (String())
-#define TTRN(m_value) (String())
-#define DTR(m_value) (String())
-#define DTRN(m_value) (String())
+#define TTR(m_value) String()
+#define TTRN(m_value) String()
+#define DTR(m_value) String()
+#define DTRN(m_value) String()
 #define TTRC(m_value) (m_value)
 #define TTRGET(m_value) (m_value)
 #endif