Display percentage in decimal instead of integer in 'df' command from fossilcons.

This is more consistent with the 'check' command, which displays percentages in decimal.

Reference: /n/sources/patch/applied/fossil-df-float
Date: Fri Nov 18 23:47:54 CET 2011
Signed-off-by: djc@9grid.fr

--- /sys/src/cmd/fossil/9fsys.c	Fri Nov 18 23:47:39 2011
+++ /sys/src/cmd/fossil/9fsys.c	Fri Nov 18 23:53:08 2011
@@ -844,9 +844,9 @@
 
 	fs = fsys->fs;
 	cacheCountUsed(fs->cache, fs->elo, &used, &tot, &bsize);
-	consPrint("\t%s: %,llud used + %,llud free = %,llud (%llud%% used)\n",
+	consPrint("\t%s: %,llud used + %,llud free = %,llud (%.1f%% used)\n",
 		fsys->name, used*(vlong)bsize, (tot-used)*(vlong)bsize,
-		tot*(vlong)bsize, used*100LL/tot);
+		tot*(vlong)bsize, (float)used*100LL/tot);
 	return 1;
 }