Remove duplicate center alignment style for equations (typst#6667)

Author: laurmaedje

crates/typst-library/src/math/equation.rs

@@ -168,7 +168,6 @@ impl ShowSet for Packed<EquationElem> {
     fn show_set(&self, styles: StyleChain) -> Styles {
         let mut out = Styles::new();
         if self.block.get(styles) {
-            out.set(AlignElem::alignment, Alignment::CENTER);
             out.set(AlignElem::alignment, Alignment::CENTER);
             out.set(BlockElem::breakable, false);
             out.set(ParLine::numbering, None);