Use path to HexChat instead of XChat in the test program

Note that this affects the test program only. It doesn't affect users
of FiSHLiM. The reason for this change is that XChat doesn't seem to be
maintained any longer.

plugins/fishlim/test.c

@@ -31,7 +31,7 @@
 // We can't use the HexChat plugin API from here...
 gchar *get_config_filename() {
     const gchar *homedir = g_get_home_dir();
-    return g_build_filename(homedir, ".xchat2", "blow.ini", NULL);
+    return g_build_filename(homedir, ".config", "hexchat", "blow.ini", NULL);
 }