Fix/column number

[Utkarsh-khambra]

Description

Describe your changes in detail

In default config
When scrollbar is hidden, the terminal viewport is actually 81 cols because the scrollbar space is also used for columns too. So here I subtract scrollBar width from total width. This keeps the number columns same for both hidden scrollbar and visible scrollbar.

Motivation and Context

Why is this change required? What problem does it solve?

Because if terminal width is specified to be 80 cols then it should be 80 cols for both scrollbar hidden and visible.

How Has This Been Tested?

• Please describe how you tested your changes.
  Run printf '\e[18t' to check number of columns.
• see how your change affects other areas of the code, etc.
  It doesn't affect other parts of code

Checklist:

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• I have read the CONTRIBUTING document in my spoken language, and understand the terms
• I have updated (or added) the documentation accordingly.
• I have added tests to cover my changes.
• I have gone through all the steps, and have thoroughly read the instructions