VX_TRACKER: Use prefix string correctly

[osm]

No description provided.

[dsvensson]

Nice...

/.../ezquake-source/src/vx_tracker.c:331:37: error: format specifies type 'char *' but the argument has type 'cvar_t' (aka 'struct cvar_s') [-Werror,-Wformat]
                        Com_Printf("%s%s%s%s%s%s%s%s\n", amf_tracker_string_inconsole_prefix, text1 ? text1 : "", text1 && text2 ? " " : "", text2 ? text2 : "", text2 && text3 ? " " : "", text3 ? text3 : "", text3 && text4 ? " " : "", text4 ? text4 : "");

from

void Com_Printf (char *fmt, ...) __attribute__ ((format(printf, 1, 2)));
void Com_DPrintf (char *fmt, ...) __attribute__ ((format(printf, 1, 2)));;

Guess some compiler consideration is needed, I'll fix later.