Use wide-string character consistently

Comparing '\r' against 8bit character instead of 16bit wide character.

src/SFML/Graphics/Text.cpp

@@ -447,7 +447,7 @@ void Text::ensureGeometryUpdate() const
         Uint32 curChar = m_string[i];
 
         // Skip the \r char to avoid weird graphical issues
-        if (curChar == '\r')
+        if (curChar == L'\r')
             continue;
 
         // Apply the kerning offset