Fix CoreHome global property typing

[mneudert]

Description:

While working on #22751 the types for the global formatting functions got messed up. This seems to be no problem with the current build, but the next update (#22707) would break:

[tsl] ERROR in /home/runner/work/matomo/matomo/plugins/CoreHome/vue/src/createVueApp.ts(31,3)
TS2322: Type '(val: string | number, maxFractionDigits?: number | undefined, minFractionDigits?: number | undefined, noSign?: boolean | undefined) => string' is not assignable to type '(val: string, cur: string, maxFractionDigits?: number | undefined, minFractionDigits?: number | undefined, noSign?: boolean | undefined) => string'.
Types of parameters 'maxFractionDigits' and 'cur' are incompatible.
Type 'string' is not assignable to type 'number | undefined'.

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed