make contourf work (again)

[Kai Habel]

Hello,

with very recent checkout I see:

octave:1> contourf(peaks)
warning: meaning may have changed due to change in precedence for && and 
|| operators
error: patch: X and Y must be of same size
error: called from:
error:   /home/kai/hg-octave/octave/scripts/plot/contourf.m at line 234, 
column 5
error:   /home/kai/hg-octave/octave/scripts/plot/contourf.m at line 67, 
column 32
octave:1>

I had to apply the attached fix

Kai
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