Set HCaptchaSiteKey on Link Account pages (go-gitea#14834)

Backport go-gitea#14834

When using HCaptcha on link account pages the site key needs to be passed
in. This PR ensures that HCaptchaSiteKey is set in the data.

Fix go-gitea#14766

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

routers/user/auth.go

@@ -746,6 +746,7 @@ func LinkAccount(ctx *context.Context) {
 	ctx.Data["CaptchaType"] = setting.Service.CaptchaType
 	ctx.Data["RecaptchaURL"] = setting.Service.RecaptchaURL
 	ctx.Data["RecaptchaSitekey"] = setting.Service.RecaptchaSitekey
+	ctx.Data["HcaptchaSitekey"] = setting.Service.HcaptchaSitekey
 	ctx.Data["DisableRegistration"] = setting.Service.DisableRegistration
 	ctx.Data["ShowRegistrationButton"] = false
 
@@ -797,6 +798,7 @@ func LinkAccountPostSignIn(ctx *context.Context, signInForm auth.SignInForm) {
 	ctx.Data["RecaptchaURL"] = setting.Service.RecaptchaURL
 	ctx.Data["CaptchaType"] = setting.Service.CaptchaType
 	ctx.Data["RecaptchaSitekey"] = setting.Service.RecaptchaSitekey
+	ctx.Data["HcaptchaSitekey"] = setting.Service.HcaptchaSitekey
 	ctx.Data["DisableRegistration"] = setting.Service.DisableRegistration
 	ctx.Data["ShowRegistrationButton"] = false
 
@@ -881,6 +883,7 @@ func LinkAccountPostRegister(ctx *context.Context, cpt *captcha.Captcha, form au
 	ctx.Data["RecaptchaURL"] = setting.Service.RecaptchaURL
 	ctx.Data["CaptchaType"] = setting.Service.CaptchaType
 	ctx.Data["RecaptchaSitekey"] = setting.Service.RecaptchaSitekey
+	ctx.Data["HcaptchaSitekey"] = setting.Service.HcaptchaSitekey
 	ctx.Data["DisableRegistration"] = setting.Service.DisableRegistration
 	ctx.Data["ShowRegistrationButton"] = false