log: Fix log_make_fancy_prefix.

There was a bug in 85932055f3116b6, that limited the length of the
program name in stderr logs to 10 characters only. The reason is that I
misunderstood the previous code, that actually formatted the progname on
*at least* 10 characters...

Change-Id: I2cfc257e3813d932144a81498d369c2072d5beaf
Priv-Id: 21799bea0aaa374139bc1b089c9b0a389c7bdde0

Author: LpZ-squall

src/core/log.c

@@ -822,7 +822,7 @@ int log_make_fancy_prefix(lstr_t progname, int pid, char fancy[static 64])
         TERM_COLOR_BRIGHTER(TERM_COLOR_GREEN),
         TERM_COLOR_BRIGHTER(TERM_COLOR_BLUE),
     };
-    char buf_progname[10 + 1];
+    char buf_progname[64];
     uint32_t hash;
     const char *color;
     int len;