[4.0] fix notice in httpheaders plugin

[zero-24]

Summary of Changes

fix notice in httpheaders plugin cc @wilsonge should be obvious on code review.

[Quy]

I get the following in the back end:

Warning: hash() expects parameter 2 to be string, array given in \plugins\system\httpheaders\httpheaders.php on line 165

[zero-24]

hmm it seams something different is happening here:

https://github.com/joomla/joomla-cms/blob/4.0-dev/plugins/system/httpheaders/httpheaders.php#L154-L178

That results into $scriptContent or $styleContent to be an array but i would like to keep that of for now. Can you please create an issue for that?

An fix could be to check that $scriptContent is an array and than do a loop over them to generate the hashes.

[Quy]

I have tested this item ✅ successfully on 7ea1950

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[ChristineWk]

I have tested this item ✅ successfully on 7ea1950

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/28318.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/28318.}

[wilsonge]

Thanks!