Fix TypeError when extracting KB from title

[EarthGrob]

In some cases the title value in wua_history can be returned as
bytes instead of str. This causes re.search to raise a
TypeError when attempting to extract KB identifiers.

This change ensures the value is decoded to str before applying the
regex, preventing the crash. Fixes #1414.

Additionally, the KB regex was tightened to match valid KB identifiers
(KB\d+) instead of allowing arbitrary characters.

Proposed Changes
• Decode value to str when it is bytes in the title field
• Update regex from (KB.[0-9]*) to (KB\d+)
• Use group(1) to extract the KB identifier

How to test
• Run: dissect.target -p windows.wua_history
• Ensure no TypeError is raised when processing records
• Verify KB identifiers are still correctly extracted from titles

[Paradoxis]

@EarthGrob changing the regex might lead to unwanted behavior, the old regex checked for any character and zero or more digits and this one removes that and always expects one character to be present

[EarthGrob]

Understood @Paradoxis, will open up a separate issue to address the regex

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[EarthGrob]

@DissectBot agree