DEV: Use double quotes for js-flags (#14693)

DEV: Use double quotes for js-flags (#14693)

Single quotes seem to be raising parse errors in some CI situations. Switching to double quotes seems to fix the problem.

diff --git a/app/assets/javascripts/discourse/testem.js b/app/assets/javascripts/discourse/testem.js
index 50b41a2..7cf254e 100644
--- a/app/assets/javascripts/discourse/testem.js
+++ b/app/assets/javascripts/discourse/testem.js
@@ -41,7 +41,7 @@ module.exports = {
       "--remote-debugging-port=4201",
       "--window-size=1440,900",
       "--enable-precise-memory-info",
-      "--js-flags='--max_old_space_size=512 --max_semi_space_size=512'",
+      '--js-flags="--max_old_space_size=512 --max_semi_space_size=512"',
     ].filter(Boolean),
     Firefox: ["-headless", "--width=1440", "--height=900"],
     "Headless Firefox": ["--width=1440", "--height=900"],

GitHub sha: 50f4f438257fb6761172201a9f0a4af80b6e7dd8

This commit appears in #14693 which was approved by jjaffeux. It was merged by SamSaffron.