bug#5839: 23.1.94; Remove `Narrow' from mode indicators for Info mode

[Drew Adams]

emacs -Q
C-h i
 
`Narrow' appears in the list of mode indicators in the mode line, along
with `Info'. This doesn't make sense for Info mode, where widening is
not something to encourage.
 
In GNU Emacs 23.1.94.1 (i386-mingw-nt5.1.2600)
 of 2010-03-23 on G41R2F1
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags
-Ic:/imagesupport/include'