Revert "Use json from legacy-modes"

This reverts commit 1f3978dd6b038ca07f5514d23689ede3edc94403.

The reason why under the moder lang-json that it didn't highlight as
well, was because the default theme doesn't highlight everything.
For example it doesn't highlight propertyName.

We have to create our own theme that highlights it.

Change-Id: I4899f5199484d22c317a2e238b132a307e01548b
(cherry picked from commit 67b12072c8e05a921324c7cebf3b3cea68f70c9a)

web/element/language.ts

diff --git a/web/element/language.ts b/web/element/language.ts
index ba76215..d26b034 100644
--- a/web/element/language.ts
+++ b/web/element/language.ts
@@ -46,7 +46,6 @@
 import {http} from '@codemirror/legacy-modes/mode/http';
 import {idl} from '@codemirror/legacy-modes/mode/idl';
 import {jinja2} from '@codemirror/legacy-modes/mode/jinja2';
-import {json} from '@codemirror/legacy-modes/mode/javascript';
 import {jsonld} from '@codemirror/legacy-modes/mode/javascript';
 import {julia} from '@codemirror/legacy-modes/mode/julia';
 import {kotlin} from '@codemirror/legacy-modes/mode/clike';
@@ -111,6 +110,7 @@
 import {html} from '@codemirror/lang-html';
 import {java} from '@codemirror/lang-java';
 import {javascript} from '@codemirror/lang-javascript';
+import {json} from '@codemirror/lang-json';
 import {less} from '@codemirror/lang-less';
 import {markdown} from '@codemirror/lang-markdown';
 import {php} from '@codemirror/lang-php';
@@ -161,7 +161,7 @@
     case 'text/x-cmake':
       return StreamLanguage.define(cmake);
     case 'application/json':
-      return StreamLanguage.define(json);
+      return json();
     case 'text/x-cobol':
       return StreamLanguage.define(cobol);
     case 'text/x-coffeescript':