Enable tests that were disabled before.

build.rs

@@ -74,8 +74,6 @@ fn is_expect_fail(name: &str) -> Option<&str> {
         "drawer_drawer_with_headline_inside" => Some("Apparently lines with :end: become their own paragraph. This odd behavior needs to be investigated more."),
         "element_container_priority_footnote_definition_dynamic_block" => Some("Apparently broken begin lines become their own paragraph."),
         "paragraphs_paragraph_with_backslash_line_breaks" => Some("The text we're getting out of the parse tree is already processed to remove line breaks, so our comparison needs to take that into account."),
-        "export_snippet_paragraph_break_precedent" => Some("Emacs 28 has broken behavior so the tests in the CI fail."),
-        "trailing_whitespace_blank_lines_after_paragraphs" => Some("Waiting on mailing list response about ownership of the trailing blank lines."),
         _ => None,
     }
 }