JIRA ticket: LIMS-1799

Summary:

#827 introduced a check on the shipment safety level, for queueing containers, but the check was case sensitive. This makes it case-insensitive as the field is text, not an enum.
Also fix a couple of minor things that github complains about in PRs.

Changes:

• Make the check for shipping safety level be case insensitive
• Do not access Object.prototype method 'hasOwnProperty' from target object, use Object.prototype.hasOwnProperty.call instead
• Use this.$ instead of $ in views

To test:

• Set a shipment to safety level 'GREEN', eg

update Shipping set SAFETYLEVEL='GREEN' where shippingId=71932;

• Go to /containers/cid/341023 and check the puck can be unqueued and queued freely
• Set the same shipment to 'YELLOW' (or any capitalisation, refresh the page and check the puck cannot be queued any more.