Fixed Bash delete steps

Steps had been changed and had incorrect syntax:

* Missing `bearer` in token
* Missing bash variable expansion `$`

Author: ryanborMSFT

articles/cloud-shell/troubleshooting.md

@@ -184,7 +184,7 @@ In order to **delete** your user settings Cloud Shell saves for you such as pref
 Bash:
 
   ```
-  token=(az account get-access-token --resource "https://management.azure.com/" | jq -r ".access_token")
+  token="Bearer $(az account get-access-token --resource "https://management.azure.com/" | jq -r ".accessToken")"
   curl -X DELETE https://management.azure.com/providers/Microsoft.Portal/usersettings/cloudconsole?api-version=2017-12-01-preview -H Authorization:"$token"
   ```