Wrong test logic of tidb_super_read_only

[guo-shaoge]

Bug Report

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1. Minimal reproduce step (Required)

tidb/pkg/session/session.go

Line 510 in d2f3f36

if !s.sessionVars.InRestrictedSQL && variable.RestrictedReadOnly.Load() || variable.VarTiDBSuperReadOnly.Load() {

tidb/pkg/planner/optimize.go

Line 153 in d2f3f36

if !sctx.GetSessionVars().InRestrictedSQL && variable.RestrictedReadOnly.Load() || variable.VarTiDBSuperReadOnly.Load() {

I think should be if !sctx.GetSessionVars().InRestrictedSQL && (variable.RestrictedReadOnly.Load() || variable.VarTiDBSuperReadOnly.Load())

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)