Use smaller buffer for strncpy().

This commit (hopefully) fixes an issue with `strncpy()` that Codacy
pointed out.  I changed the "n" value from BUFSIZE to a saner 14
characters, the length of the string plus room for the NULL
terminator.

src/aprs-is.c

@@ -133,7 +133,7 @@ sendPacket (const char* const restrict server,
 
 		if (timeout <= 0)
 		{
-			strncpy(timeoutText, " (no timeout)", BUFSIZE);
+			strncpy(timeoutText, " (no timeout)", 14);
 		}
 
 		switch (addressinfo->sa_family)