syntax: update formatting

BurntSushi · BurntSushi · commit ad89e8c8fe1b · 2020-04-27T21:24:08.000-04:00
rustfmt appears to have had a slight tweak. This also fixes CI.
diff --git a/regex-syntax/src/hir/mod.rs b/regex-syntax/src/hir/mod.rs
@@ -1496,7 +1496,7 @@ macro_rules! define_bool {
                 self.bools &= !(1 << $bit);
             }
         }
-    }
+    };
 }
 
 impl HirInfo {
