Fixed double decode issue with MIME::Tools.
Fixed double decode issue with MIME::Tools.

MIME::Tools > 5.500 returns the result of ->recommended_filename
as UTF-8. We no longer need to decode this string.

Because the string is already decoded, if we decode it again
with the encoding of the original name, this can lead to trouble
(and on Win32 apparently even to 100% CPU usage!).

muehlbauer/otrs,thorsteneckel/otrs,mburggraf/otrs,PortgasDAce/otrs,moritz/otrs,s7design/otrs,linearregression/otrs,MBRG/otrs,balazj/otrs,MBRG/otrs,nilei/otrs,xhoy/otrs,mbeijen/otrs-1,oiami/otrs,mburggraf/otrs,capeit-tto/otrs,thorsteneckel/otrs,rudy500/otrs,mbeijen/otrs-1,xhoy/otrs,muehlbauer/otrs,vlascoder/otrs,StCyr/otrs,moritz/otrs,muehlbauer/otrs,brandonshults01/otrs,eliasp/otrs,xhoy/otrs,s7design/otrs,capeit-tto/otrs,s7design/otrs,brandonshults01/otrs,nilei/otrs,thorsteneckel/otrs,noritnk/otrs,thorsteneckel/otrs,rudy500/otrs,eliasp/otrs,nilei/otrs,moritz/otrs,brandonshults01/otrs,eliasp/otrs,crythias/otrs,s7design/otrs,oiami/otrs,PortgasDAce/otrs,StCyr/otrs,MBRG/otrs,balazj/otrs,linearregression/otrs,PortgasDAce/otrs,mburggraf/otrs,StCyr/otrs,balazj/otrs,vlascoder/otrs,mburggraf/otrs,rudy500/otrs,noritnk/otrs,mburggraf/otrs,linearregression/otrs,vlascoder/otrs,mbeijen/otrs-1,PortgasDAce/otrs,PortgasDAce/otrs,crythias/otrs,nilei/otrs,crythias/otrs,s7design/otrs,nilei/otrs,rudy500/otrs,capeit-tto/otrs,muehlbauer/otrs,muehlbauer/otrs,linearregression/otrs,balazj/otrs,StCyr/otrs,moritz/otrs,balazj/otrs,brandonshults01/otrs,eliasp/otrs,linearregression/otrs,crythias/otrs,oiami/otrs,eliasp/otrs,MBRG/otrs,noritnk/otrs,rudy500/otrs,moritz/otrs,oiami/otrs,xhoy/otrs,crythias/otrs,StCyr/otrs,MBRG/otrs,brandonshults01/otrs,xhoy/otrs,thorsteneckel/otrs,oiami/otrs