Fix regex for octal literal matching

[mbaluda]

Description

Motivated by this FP alert, the PR reverts 8b39244

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Reviewer

• Have all the relevant rule package description files been checked in?
• Have you verified that the metadata properties of each new query is set appropriately?
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• Are the alert messages properly formatted and consistent with the style guide?
• Have you run the queries on OpenPilot and verified that the performance and results are acceptable?
  As a rule of thumb, predicates specific to the query should take no more than 1 minute, and for simple queries be under 10 seconds. If this is not the case, this should be highlighted and agreed in the code review process.
• Does the query have an appropriate level of in-query comments/documentation?
• Have you considered/identified possible edge cases?
• Does the query not reinvent features in the standard library?
• Can the query be simplified further (not golfed!)

[Copilot]

Pull request overview

This PR updates the octal-integer literal recognition logic in the Cpp14Literal modeling library by tightening the regular expression used to identify OctalLiterals.

Changes:

• Changed the OctalLiteral regex from allowing zero-or-more octal digits after the leading 0 to requiring one-or-more.
• (Potentially) changes how the literal 0 (and 0U/0ULL, etc.) is classified across queries that depend on Cpp14Literal.

Show a summary per file

File	Description
cpp/common/src/codingstandards/cpp/Cpp14Literal.qll	Modifies the OctalLiteral regexp used to classify C++14 octal integer literals.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 1