Add / enhance checker for incorrect icon links

[mcm1957]

https://github.com/iobroker-community-adapters/ioBroker.fakeroku/master/admin/fakeroku.png

https://raw.githubusercontent.com/iobroker-community-adapters/ioBroker.opensmartcity/master/admin/opensmartcity.png

https://raw.githubusercontent.com/oweitman/ioBroker.rssfeed/main/admin/rssfeed.png

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Besides fixing some sort of checker should be added.

[mcm1957]

Fiing log:

• https://github.com/iobroker-community-adapters/ioBroker.fakeroku/master/admin/fakeroku.png (latest)

• https://github.com/iobroker-community-adapters/ioBroker.fakeroku/master/admin/fakeroku.png (stable)

• https://raw.githubusercontent.com/iobroker-community-adapters/ioBroker.opensmartcity/master/admin/opensmartcity.png (latest)

• https://raw.githubusercontent.com/iobroker-community-adapters/ioBroker.opensmartcity/master/admin/opensmartcity.png (stable - NOT existing)

• https://raw.githubusercontent.com/oweitman/ioBroker.rssfeed/main/admin/rssfeed.png (latest)

• https://raw.githubusercontent.com/oweitman/ioBroker.rssfeed/main/admin/rssfeed.png (stable)

[mcm1957]

All links are correct now.

Checker should be enhanced

[klein0r]

Why is the icon url of this repository ignored? Example:

ioBroker.repositories/sources-dist-stable.json

Lines 425 to 430 in a948043

	"device-reminder": {
	"meta": "https://raw.githubusercontent.com/xenon-s/ioBroker.device-reminder/master/io-package.json",
	"icon": "https://raw.githubusercontent.com/xenon-s/ioBroker.device-reminder/master/admin/device-reminder.png",
	"type": "logic",
	"version": "3.1.2"
	},

http://download.iobroker.net/sources-dist.json

"extIcon":"https://raw.githubusercontent.com/xenon-s/ioBroker.device-reminder/master/admin/icon.png"

And that isn't the url of the repository:

https://github.com/Xenon-s/ioBroker.device-reminder/blob/91e91734160e16d862ea7bfa449c11ca5d40b27b/io-package.json#L61