Use g_strlcpy() instead of g_snprintf(dest, strlen(dest), "%s", src)

Fixes a SIGABRT at startup on OpenBSD, for some reason deep in the glib/libc
stack the va_list arg p is lost.. g_strlcpy() is equivalent here, and even faster.

src/task-manager.c

@@ -146,7 +146,7 @@ pretty_cmdline (gchar *cmdline, gchar *comm)
 			gchar *p = g_strstr_len (text, -1, comm);
 			if (p != NULL)
 			{
-				g_snprintf (text, g_utf8_strlen (text, -1), "%s", p);
+				g_strlcpy (text, p, g_utf8_strlen (text, -1));
 			}
 		}
 	}