TermInput.js: Encode and quote terms, not the other way round

Any separator which needs to be encoded, won't be detected
and thus no unnecessary quoting happens. If, on the other
hand, the quoting is necessary due to an unencoded separator,
the quotes are not encoded, as the server doesn't expect or
need this.

asset/js/widget/TermInput.js

@@ -73,14 +73,15 @@ define(["../notjQuery", "BaseInput"], function ($, BaseInput) {
         termsToQueryString(terms) {
             let quoted = [];
             for (const termData of terms) {
-                if (termData.search.indexOf(this.separator) >= 0) {
-                    quoted.push({ ...termData, search: '"' + termData.search + '"' });
-                } else {
-                    quoted.push(termData);
+                let search = this.encodeTerm(termData).search;
+                if (search.indexOf(this.separator) >= 0) {
+                    search = '"' + termData.search + '"';
                 }
+
+                quoted.push(search);
             }
 
-            return super.termsToQueryString(quoted);
+            return quoted.join(this.separator).trim();
         }
 
         complete(input, data) {