CGUITTFont: call final virtual function in constructor

gframe/CGUITTFont.cpp

@@ -809,11 +809,6 @@ core::vector2di CGUITTFont::getKerning(const uchar32_t thisLetter, const uchar32
 }
 
 void CGUITTFont::setInvisibleCharacters(const wchar_t *s) {
-	core::ustring us(s);
-	Invisible = us;
-}
-
-void CGUITTFont::setInvisibleCharacters(const core::ustring& s) {
 	Invisible = s;
 }
 

gframe/CGUITTFont.h

@@ -295,8 +295,7 @@ public:
 	s32 getKerningHeight() const override;
 
 	//! Define which characters should not be drawn by the font.
-	void setInvisibleCharacters(const wchar_t *s) override;
-	void setInvisibleCharacters(const core::ustring& s);
+	void setInvisibleCharacters(const wchar_t *s) final;
 
 	//! Get the last glyph page if there's still available slots.
 	//! If not, it will return zero.