(player_coms, lstats, lsta): Rename command lstats' to lstat' to

match info as well as related commands `sstat' and `pstat'.  Rename
lstats() to lsta() to uphold the convention that functions
implementing commands are named like the command or its four character
prefix.  Closes #804587.

src/lib/commands/lstat.c

@@ -45,7 +45,7 @@
 #include "commands.h"
 
 int
-lstats(void)
+lsta(void)
 {
     int nunits;
     struct nstr_item ni;