Remove not used filter

bubble-server/src/main/java/bubble/rule/request/HttpHeaderReplacementFilter.java

@@ -1,18 +0,0 @@
-package bubble.rule.request;
-
-import org.cobbzilla.util.io.regex.RegexLimitedReplacementFilter;
-
-import java.util.regex.Pattern;
-
-public class HttpHeaderReplacementFilter extends RegexLimitedReplacementFilter {
-    private static final String HTTP_HEADER_BORDER_REGEX = "\r?\n\r?\n";
-
-    private HttpHeaderReplacementFilter(String regex, int group, String replacement, String stopRegex,
-                                        int stopRegexMatchingFlags) {
-        // should not be used
-    }
-
-    public HttpHeaderReplacementFilter(String regex, String replacement) {
-        super(regex, 0, replacement, HTTP_HEADER_BORDER_REGEX, Pattern.MULTILINE);
-    }
-}