konsole: fix column width calculation for string

TQString accessor is 0-based.

Signed-off-by: OBATA Akio <obache@wizdas.com>
(cherry picked from commit 928fbada0a)

konsole/konsole/konsole_wcwidth.cpp

@@ -213,7 +213,7 @@ int string_width( const TQString &txt )
 {
   int w = 0;
 
-  for ( uint i = 1; i < txt.length(); ++i ) {
+  for ( uint i = 0; i < txt.length(); ++i ) {
     w += konsole_wcwidth(txt[i].unicode());
   }
  return w;