Switch to full tab options

- Google Chrome 74 seems to have an issue with Talkie's options page.
- The options page itself works fine, but displaying it in Chrome's extension details page for Talkie does not work. Nothing displayed, no error message.
- The recommended options page style is (was?) to use the predefined in-browser options page. It seems this no longer works for Talkie.
- This commit changes options ui settings to instead use a full tab for the options.
- Further user interface changes are needed to make this pretty, as the previous version relied on the browser's extension branding the options.

manifest.json

@@ -73,7 +73,9 @@
   },
   "options_ui": {
     "page": "./src/options/options.html",
-    "chrome_style": true
+    "chrome_style": false,
+    "browser_style": false,
+    "open_in_tab": true
   },
   "requirements": {},
   "offline_enabled": true,