ref tests: be less sensitive to trailing spaces

test-normalizer.sed

@@ -4,3 +4,5 @@ s/subgoal/goal/g
 /[0-9]* focused goals\?$/{N;s/\n */ /;}
 # locations in Fail added in https://github.com/coq/coq/pull/15174
 /^File/d
+# extra space removed in https://github.com/coq/coq/pull/16130
+s/= $/=/

tests/notation.ref

 test_2 = {[10 := {[10 := 1]}; 20 := {[20 := 2]}]}
      : M (M nat)
-test_3 = 
+test_3 =
 {[10 := {[10 := 1]}; 20 := {[20 := 2]}; 30 := {[30 := 3]}]}
      : M (M nat)
-test_4 = 
+test_4 =
 {[10 := {[10 := 1]}; 20 := {[20 := 2]}; 30 := {[30 := 3]}; 40 := {[40 := 4]}]}
      : M (M nat)
-test_op_2 = 
+test_op_2 =
 {[10 := {[10 ^ 2 := 99]}; 10 + 1 := {[10 - 100 := 42 * 1337]}]}
      : M (M nat)
-test_op_3 = 
+test_op_3 =
 {[10 := {[20 - 2 := [11]; 1 := [22]]};
   20 := {[99 + length [1] := [1; 2; 3]]};
   4 := {[4 := [4]]};
   5 := {[5 := [5]]}]}
      : M (M (list nat))
-test_op_4 = 
+test_op_4 =
 {[10 := {[20 - 2 := [11];
           1 := [22];
           3 := [23];
@@ -30,6 +30,6 @@ test_gmultiset_2 = {[+ 10; 11 +]}
      : gmultiset nat
 test_gmultiset_3 = {[+ 10; 11; 2 - 2 +]}
      : gmultiset nat
-test_gmultiset_4 = 
+test_gmultiset_4 =
 {[+ {[+ 10 +]}; ∅; {[+ 2 - 2; 10 +]} +]}
      : gmultiset (gmultiset nat)