In light of the previous commit, revert atom length for UAs and OS

Keep devices at 2 as it benefits *massively*, but UAs and OS seem to
either not benefit or be slightly hampered by smaller atoms.

Would be a good idea to investigate why eventually, and maybe make the
bench scripts more flexible so they can be more easily run across the
three categories and with varied atom lengths.

Author: masklinn

ua-parser/src/lib.rs

@@ -176,7 +176,7 @@ pub mod user_agent {
         /// Initialise an empty builder.
         pub fn new() -> Self {
             Self {
-                builder: regex_filtered::Builder::new_atom_len(2),
+                builder: regex_filtered::Builder::new_atom_len(3),
                 repl: Vec::new(),
             }
         }
@@ -343,7 +343,7 @@ pub mod os {
         ///
         pub fn new() -> Self {
             Self {
-                builder: regex_filtered::Builder::new_atom_len(2),
+                builder: regex_filtered::Builder::new_atom_len(3),
                 repl: Vec::new(),
             }
         }