linters: enable stylecheck (#4153)

Refs #3262

behaviour/reporter_test.go

@@ -108,13 +108,13 @@ func TestEqualPeerBehaviours(t *testing.T) {
 
 	for _, test := range equals {
 		if !equalBehaviours(test.left, test.right) {
-			t.Errorf("Expected %#v and %#v to be equal", test.left, test.right)
+			t.Errorf("expected %#v and %#v to be equal", test.left, test.right)
 		}
 	}
 
 	for _, test := range unequals {
 		if equalBehaviours(test.left, test.right) {
-			t.Errorf("Expected %#v and %#v to be unequal", test.left, test.right)
+			t.Errorf("expected %#v and %#v to be unequal", test.left, test.right)
 		}
 	}
 }
@@ -194,7 +194,7 @@ func TestMockPeerBehaviourReporterConcurrency(t *testing.T) {
 	for _, items := range behaviourScript {
 		reported := pr.GetBehaviours(items.peerID)
 		if !equalBehaviours(reported, items.behaviours) {
-			t.Errorf("Expected peer %s to have behaved \nExpected: %#v \nGot %#v \n",
+			t.Errorf("expected peer %s to have behaved \nExpected: %#v \nGot %#v \n",
 				items.peerID, items.behaviours, reported)
 		}
 	}