feat: remove remaining use of session.toml

programs/include/montauk/wifi.h

@@ -17,7 +17,7 @@
     * a raw PSK). Anyone who can read 0:/config can read the keys.
     *
     * No default copy of this file ships in the image, deliberately. Every other
-    * config an app writes (bluetooth.toml, display.toml, session.toml) is
+    * config an app writes (bluetooth.toml, display.toml) is
     * created on demand for the same reason: a shipped copy is laid down again
     * by anything that refreshes the system files, and it would overwrite the
     * networks the user had saved.