Leave url field blank when creating cards from search page

* Add empty string to field if url starts with chrome-extension or moz-extension

* Check for external protocl value instead

* Change url field in unit tests to empty string

* Check if url protocl matches window's protocol

* Fix unit tests

* Use slice instead of replaceAll

* Remove url from context before rendering templates

<rikaitan.link>MTIwZjBhZjRmNjliZjNhMWMwMDY3NzZhNjg5Y2JjM2JlMWUwNThjNAo=</rikaitan.link>

ext/js/data/anki-note-builder.js

@@ -81,6 +81,11 @@ export class AnkiNoteBuilder {
             }
         }
 
+        // Make URL field blank if URL source is Rikaitan
+        if (URL.canParse(context.url) && new URL(context.url).protocol === new URL(import.meta.url).protocol) {
+            context.url = '';
+        }
+
         const commonData = this._createData(dictionaryEntry, mode, context, resultOutputMode, glossaryLayoutMode, compactTags, media, dictionaryStylesMap);
         const formattedFieldValuePromises = [];
         for (const [, fieldValue] of fields) {