Fixed incorrect display of SQL calltips containing non-US-ASCII characters

There is a further problem when the calltip is displayed after clicking
one of the arrows for overloaded functions.

This was first reported in sqlitebrowser#1107 (Russian) and sqlitebrowser#1206 (Korean). The subcase
has been reported in PR sqlitebrowser#2424.

Patch reported in the QScintilla list, so there is no need to keep a new
patch. It is assumed to come in new QScintilla versions.

Author: mgrojo

libs/qscintilla/Qt4Qt5/qsciscintilla.cpp

@@ -470,7 +470,10 @@ void QsciScintilla::handleCallTipClick(int dir)
     if (ct_cursor > 0)
         ct.prepend('\001');
 
-    SendScintilla(SCI_CALLTIPSHOW, adjustedCallTipPosition(shift), ct.toLatin1().data());
+    ScintillaBytes ct_bytes = textAsBytes(ct);
+    const char *cts = ScintillaBytesConstData(ct_bytes);
+
+    SendScintilla(SCI_CALLTIPSHOW, adjustedCallTipPosition(shift), cts);
 }