checker: fix const from comptime if expr (fix #19169)

[yuyi98]

This PR fix const from comptime if expr (fix #19169).

• Fix const from comptime if expr.
• Add test.

import term

const (
	color = $if windows {
		term.bright_cyan('WINDOWS')
	} $else {
		term.bright_green('UNIX')
	}
)

fn main() {
	salutation := 'hello'
	// works if you add `'' +` before 'color'
	val := match salutation {
		'hello' { color + ' some text' }
		'goodbyte' { color + ' some other text' }
		else { 'invalid' }
	}
	println(val)
	assert true
}

PS D:\Test\v\tt1> v run .
WINDOWS some text

[spytheman]

Great!