Fix inconsistencies in variable names for struct methods (#13561)

model/access.go

@@ -60,13 +60,13 @@ func (ad *AccessData) IsValid() *AppError {
 	return nil
 }
 
-func (me *AccessData) IsExpired() bool {
+func (ad *AccessData) IsExpired() bool {
 
-	if me.ExpiresAt <= 0 {
+	if ad.ExpiresAt <= 0 {
 		return false
 	}
 
-	if GetMillis() > me.ExpiresAt {
+	if GetMillis() > ad.ExpiresAt {
 		return true
 	}