resources/page: Escaping colon in front matter url doesn't work with section pages

[jmooring]

content/s1/_index.md

---
title: s1
url: "/a\\:b/:slug/"
---

The published path does not have a colon. It is public/ab/s1/index.html instead of public/a:b/s1/index.html.

I have modified the existing integration test to include this case:

// Issue 12948.
// Issue 12954.
func TestPermalinksWithEscapedColons(t *testing.T) {
	t.Parallel()

	if htesting.IsWindows() {
		t.Skip("Windows does not support colons in paths")
	}

	files := `
-- hugo.toml --
disableKinds = ['home','rss','sitemap','taxonomy','term']
[permalinks.page]
s2 = "/c\\:d/:slug/"
-- content/s1/_index.md --
---
title: s1
url: "/a\\:b/:slug/"
---
-- content/s1/p1.md --
---
title: p1
url: "/a\\:b/:slug/"
---
-- content/s2/p2.md --
---
title: p2
---
-- layouts/_default/single.html --
{{ .Title }}
-- layouts/_default/list.html --
{{ .Title }}
`

	b := hugolib.Test(t, files)

	b.AssertFileExists("public/a:b/p1/index.html", true)
	b.AssertFileExists("public/a:b/s1/index.html", true)

	// The above URLs come from the URL front matter field where everything is allowed.
	// We strip colons from paths constructed by Hugo (they are not supported on Windows).
	b.AssertFileExists("public/cd/p2/index.html", true)
}

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