Fix filtered HTTP headers in data binding

Prior to this commit, several common HTTP headers were ignored from the
data binding process when collecting property values, in gh-34039 and
gh-34182.

This commit completes the initial enhancement by ensuring that the
default header predicate is also considering cases where constructor
binding is applied and the Java type has a lowercase variant of the HTTP
header name to filter.

Fixes gh-34292

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/InitBinderBindingContextTests.java

@@ -224,7 +224,7 @@ class InitBinderBindingContextTests {
 
 	@ParameterizedTest
 	@ValueSource(strings = {"Accept", "Authorization", "Connection",
-			"Cookie", "From", "Host", "Origin", "Priority", "Range", "Referer", "Upgrade"})
+			"Cookie", "From", "Host", "Origin", "Priority", "Range", "Referer", "Upgrade", "priority"})
 	void filteredHeaders(String headerName) throws Exception {
 		MockServerHttpRequest request = MockServerHttpRequest.get("/path")
 				.header(headerName, "u1")