Sort lints lexicographically in .cargo/config.toml

.cargo/config.toml

@@ -10,6 +10,7 @@ ruma-clippy = """\
     -W clippy::cloned_instead_of_copied \
     -W clippy::dbg_macro \
     -W clippy::empty_line_after_outer_attr \
+    -W clippy::exhaustive_structs \
     -W clippy::inefficient_to_string \
     -W clippy::macro_use_imports \
     -W clippy::map_flatten \
@@ -21,7 +22,6 @@ ruma-clippy = """\
     -W clippy::unseparated_literal_suffix \
     -W clippy::useless_let_if_seq \
     -W clippy::wildcard_imports \
-    -W clippy::exhaustive_structs \
 """
 
 [doc.extern-map.registries]