fix: undefined symbol reset to global setting

[Babyze]

Description

• Fix undefined symbol when reset Customize Setting to Global Setting

Related Issue

N/A

Motivation and Context

• I want to reset symbol setting to Global setting, but it fails and shows "Restarting undefined websockets..."
• Receive some error notifications:

(06:54:51.679) Uncaught Exception:
If you see this, kindly report it to: https://github.com/chrisleekr/binance-trading-bot/issues/new?assignees=&labels=bug&template=bug_report.md&title=
Code: undefined
Message: Cannot read property 'toLowerCase' of undefined
Stack: TypeError: Cannot read property 'toLowerCase' of undefined
at /srv/node_modules/binance-api-node/dist/websocket.js:398:72
at Array.map ()
at Object.miniTicker (/srv/node_modules/binance-api-node/dist/websocket.js:397:62)
at setupTickersWebsocket (/srv/dist/server.js:1:4145)
at async Promise.all (index 2)
at async /srv/dist/server.js:1:131303
Current API Usage: 82

(06:25:47.876) Execution failed:
Job: Trailing Trade
Code: undefined
Message: Cannot read property 'filters' of undefined
Stack: TypeError: Cannot read property 'filters' of undefined
at getSymbolInfo (/srv/app/cronjob/trailingTradeHelper/common.js:554:16)
at async execute (/srv/app/cronjob/trailingTrade/step/get-symbol-info.js:16:22)
at async /srv/app/cronjob/trailingTrade.js:149:14
at async errorHandlerWrapper (/srv/app/error-handler.js:77:5)
at async Object.execute [as processFn] (/srv/app/cronjob/trailingTrade.js:34:3)
at async executeJob (/srv/app/cronjob/trailingTradeHelper/queue.js:67:5)
at async Object.execute (/srv/app/cronjob/trailingTradeHelper/queue.js:122:20)

• Current API Usage: 40

How Has This Been Tested?

• An issue detected on my production server, I have fixed it and tested on both development and production servers

Screenshots (if appropriate):

Before:

After: