Fix Huawei WAF detection rule: server header returns elb in most cases

[serdarbsgn]

Template / PR Information

Huawei WAF detection template didn't detect an app behind CloudWAF, problem relates to response header not returning Server: CloudWAF, but Server: elb in the cases I've tried, so changed that alongside with the (?) typo in - '(?)content="CloudWAF"' regex to (?i) too.

• Updated http/technologies/waf-detect/huaweicloud patterns
• References: used https://consumer.huawei.com/tr/ (yes /tr/ is behind CloudWAF while original site isn't) to test CloudWAF pattern alongside some others, this correctly detects CloudWAF while older version didn't.

I've validated this template locally?

• [ x] YES
• NO

[GeorginaReeder]

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