r3.showdspf: fix a typo: case 3 instead of case3

[lbartoletti]

A space is missing between the case keyword and the number.

[neteler]

Please note that this (very old) module is deactivated and not compiled by default:

grass/raster3d/Makefile

Line 22 in 60f6727

r3.retile \

--> not listed

[nilason]

See also

grass/raster3d/r3.showdspf/README

Lines 10 to 15 in 60f6727

	r3.showdspf is not built by default in GRASS 6.2. If you want to build it you
	need to ./configure GRASS --with-glw support and run 'make' manually from the
	raster3d/r3.showdspf/ source directory.
	AFAIK it is the only thing in GRASS 6.2 which uses GLw:
	http://article.gmane.org/gmane.comp.gis.grass.devel/19079

[nilason]

How about to move r3.showdspf to https://github.com/OSGeo/grass-addons or delete it?

[neteler]

I'd suggest to remove it as being entirely outdated. And it's still available from older versions.

[nilason]

I'd suggest to remove it as being entirely outdated. And it's still available from older versions.

@lbartoletti Are you up to change this to remove the module?

[echoix]

Before having the code removed, I consider it a good idea to fix this missing space, so it is at least that less of a bug when someone wants to dig it up.

I opened an issue to track the remaining steps to finish off this PR and have one less open pending PR ;)