remove ancient prefs (currently in editor.js); r=ccarlen, sr=smfr, bug=202305

modules/libpref/src/mac/macprefs.js

@@ -39,9 +39,6 @@
 pref("browser.drag_out_of_frame_style", 1);
 pref("ui.key.saveLink.shift", false); // true = shift, false = meta
 
-pref("editor.use_html_editor",              false);
-pref("editor.use_image_editor",             false);
-
 // should a GURL event open a new window or re-use (4.x compat)
 pref("browser.always_reuse_window", false);