Replace remaining GetMaster() queries (#19545)

There are still some remaining which
access the raw DB struct. There will be
a separate PR to clean those up.

```release-note
NONE
```

app/post_test.go

@@ -821,7 +821,8 @@ func TestCreatePost(t *testing.T) {
 
 		sqlStore := th.GetSqlStore()
 		sql := fmt.Sprintf("select count(*) from Posts where Id = '%[1]s' or OriginalId = '%[1]s';", previewPost.Id)
-		val, err2 := sqlStore.GetMaster().SelectInt(sql)
+		var val int64
+		err2 := sqlStore.GetMasterX().Get(&val, sql)
 		require.NoError(t, err2)
 
 		require.EqualValues(t, int64(1), val)