fix hostfile hybridmap reuse

[tarunKoyalwar]

Proposed Changes

• during lazy initialization hm updated local variable instead global variable
• which caused subsequent calls to return nil instance with no /etc/hosts data
• closes Use recover() to catch runtime panics #236
• closes fix nil hostfile data during reuse #248

[tarunKoyalwar]

example

• add entry to /etc/hosts

## testing

127.0.0.1  nuclei.test

$ ./nuclei -u nuclei.test:8000 -id tech-detect -debug

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v3.1.7

		projectdiscovery.io

[INF] Current nuclei version: v3.1.7 (latest)
[INF] Current nuclei-templates version: v9.7.4 (latest)
[WRN] Scan results upload to cloud is disabled.
[INF] New templates added in latest release: 6
[INF] Templates loaded for current scan: 1
[INF] Executing 1 signed templates from projectdiscovery/nuclei-templates
[INF] Targets loaded for current scan: 1
[INF] Running httpx on input host
[INF] Found 1 URL from httpx
[INF] [tech-detect] Dumped HTTP request for http://nuclei.test:8000

GET / HTTP/1.1
Host: nuclei.test:8000
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.3319.102 Safari/537.36
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip

[DBG] [tech-detect] Dumped HTTP response http://nuclei.test:8000

HTTP/1.1 200 OK
Connection: close
Content-Length: 13
Content-Type: text/html; charset=utf-8
Date: Thu, 25 Jan 2024 16:23:25 GMT
Last-Modified: Thu, 25 Jan 2024 16:18:31 GMT

<pre>
</pre>
[INF] No results found. Better luck next time!

[Mzack9999]

lgtm - left an optional note related to failure behavior