Fix order of imports.

This fixes a bug in 916ff44a causing proof mode notations not being
pretty printed.

proofmode/tactics.v

 From iris.proofmode Require Import coq_tactics intro_patterns spec_patterns.
 From iris.algebra Require Export upred.
-From iris.proofmode Require Export notation classes.
+From iris.proofmode Require Export classes notation.
 From iris.prelude Require Import stringmap hlist.
 
 Declare Reduction env_cbv := cbv [

tests/proofmode.v

-From iris.proofmode Require Import tactics notation.
+From iris.proofmode Require Import tactics.
 From iris.proofmode Require Import pviewshifts invariants.
 
 Lemma demo_0 {M : ucmraT} (P Q : uPred M) :