[Multi-Monitor] SWT should pick the right zoom value based on the monitor it's launched.

[niraj-modi]

When we are in multi-monitor setup:

• Double check if SWT picks the right zoom for the monitor it's launched.

Here are some pointers:

• If required, we need to fix this in Display#getDeviceZoom()
• Additionally we may also update Shell() constructor to pick the correct zoom from the monitor it's launched.