[RTL] Dropdown cell type

[Siemienik]

Description

For RTL, the dropdown opens in the wrong possition and doesn't cover the current cell.

LTR	RTL

Reproduction:

1. Use this configuration:

{
    data: [['black'], ['blue'], ['black'], ['gray']],
    columns: [
        {
            type: 'dropdown',
            source: ['yellow', 'red', 'orange', 'green', 'blue', 'gray', 'black', 'white']
        }
    ],
    licenseKey: 'non-commercial-and-evaluation'
};

[Siemienik]

close as done in #8893

[aninde]

Done in v12.0.0 https://jsfiddle.net/juwat790/

[AMBudnik]

Closed with #8760 and developed and done in Handsontable v12.

For more information please check out our Release Notes - https://handsontable.com/docs/release-notes/#_12-0-0