Linter: Disable shadow linting for ctx and err

It's been a year, and I'm still getting caught out by govet demanding I
don't shadow a var I was deliberately shadowing.
Made worse by an increase in clashes with stylecheck when they both want
opposite things on the same line.

.golangci.yml

@@ -150,6 +150,9 @@ issues:
     - text: "Expect WriteFile permissions to be 0600 or less"
       linters:
         - gosec
+    - text: 'shadow: declaration of "(err|ctx)" shadows declaration at'
+      linters: [ govet ]
+
 
   exclude-dirs:
     - vendor

exchanges/btse/btse_wrapper.go

@@ -1281,7 +1281,7 @@ func (b *BTSE) UpdateOrderExecutionLimits(ctx context.Context, a asset.Item) err
 	var errs error
 	limits := make([]order.MinMaxLevel, 0, len(summary))
 	for _, marketInfo := range summary {
-		p, err := marketInfo.Pair() //nolint:govet // Deliberately shadow err
+		p, err := marketInfo.Pair()
 		if err != nil {
 			errs = common.AppendError(err, fmt.Errorf("%s: %w", p, err))
 			continue

exchanges/subscription/template.go

@@ -129,7 +129,7 @@ func expandTemplate(e iExchange, s *Subscription, ap assetPairs, assets asset.It
 	}
 
 	buf := &bytes.Buffer{}
-	if err := t.Execute(buf, subCtx); err != nil { //nolint:govet // Shadow, or gocritic will complain sloppyReassign
+	if err := t.Execute(buf, subCtx); err != nil {
 		return nil, err
 	}