Fix code geneation for sqlc.slice

Fixes #2430

Author: SoMuchForSubtlety

internal/codegen/golang/templates/stdlib/queryCode.tmpl

@@ -142,7 +142,11 @@ func (q *Queries) {{.MethodName}}(ctx context.Context, {{ dbarg }} {{.Arg.Pair}}
               query = strings.Replace(query, "/*SLICE:{{.Arg.Column.Name}}*/?", "NULL", 1)
             }
         {{- end }}
+        {{- if emitPreparedQueries }}
+        {{ queryRetval . }} {{ queryMethod . }}(ctx, nil, query, queryParams...)
+        {{- else}}
         {{ queryRetval . }} {{ queryMethod . }}(ctx, query, queryParams...)
+        {{- end -}}
     {{- else if emitPreparedQueries }}
         {{- queryRetval . }} {{ queryMethod . }}(ctx, q.{{.FieldName}}, {{.ConstantName}}, {{.Arg.Params}})
     {{- else}}

internal/endtoend/testdata/sqlc_slice_prepared/sqlite/go/db.go

@@ -0,0 +1,6 @@
+CREATE TABLE foo (id int not null, name text not null, bar text);
+
+/* name: FuncParamIdent :many */
+SELECT name FROM foo
+WHERE name = sqlc.arg(slug)
+  AND id IN (sqlc.slice(favourites));

internal/endtoend/testdata/sqlc_slice_prepared/sqlite/go/models.go

@@ -0,0 +1,13 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "engine": "sqlite",
+      "path": "go",
+      "name": "querytest",
+      "schema": "query.sql",
+      "queries": "query.sql",
+      "emit_prepared_queries": true
+    }
+  ]
+}