LibWeb/CSS: Make Supports responsible for dumping itself entirely

This will reduce the boilerplate for other things that want to dump a
Supports, such as `@import`.

Author: AtkinsSJ

Libraries/LibWeb/CSS/CSSSupportsRule.cpp

@@ -63,9 +63,7 @@ void CSSSupportsRule::dump(StringBuilder& builder, int indent_levels) const
 {
     Base::dump(builder, indent_levels);
 
-    dump_indent(builder, indent_levels + 1);
-    builder.append("Supports:\n"sv);
-    supports().dump(builder, indent_levels + 2);
+    supports().dump(builder, indent_levels + 1);
 
     dump_indent(builder, indent_levels + 1);
     builder.appendff("Rules ({}):\n", css_rules().length());

Libraries/LibWeb/CSS/Supports.cpp

@@ -6,6 +6,7 @@
 
 #include <LibJS/Runtime/Realm.h>
 #include <LibWeb/CSS/Supports.h>
+#include <LibWeb/Dump.h>
 
 namespace Web::CSS {
 
@@ -86,7 +87,9 @@ String Supports::to_string() const
 
 void Supports::dump(StringBuilder& builder, int indent_levels) const
 {
-    m_condition->dump(builder, indent_levels);
+    dump_indent(builder, indent_levels);
+    builder.appendff("Supports condition: (matches = {})\n", m_matches);
+    m_condition->dump(builder, indent_levels + 1);
 }
 
 }