Remove now unnecessary no-unsanitized/method disabling in test/unit/jasmine-boot.js

With the latest release of the `eslint-plugin-no-unsanitized` package, we no longer need to disable this rule; see https://github.com/mozilla/eslint-plugin-no-unsanitized/pull/150

test/unit/jasmine-boot.js

@@ -83,7 +83,6 @@ function initializePDFJS(callback) {
       "pdfjs-test/unit/writer_spec.js",
       "pdfjs-test/unit/xml_spec.js",
     ].map(function (moduleName) {
-      // eslint-disable-next-line no-unsanitized/method
       return SystemJS.import(moduleName);
     })
   ).then(function (modules) {