mouse.c: protocol error in Windows for bind

[Petr M. <mi...@ph...>]

In Windows, there is only one open and active graph window. 
I think this could be the reason while mouse.c:event_keypress() reports 
"protocol error" if you try e.g.:

bind 's' 'print "Hello";'
plot x*x

and then press "s" hotkey several times. 

The code after
   if (ptr->allwindows && ptr->command) {

is testing "allwindows" and "active" windows but it could somehow miss that 
case of a single-window graph. I'm not sure what should be the correct fix 
among these several if .. else if ...

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PM