feat: use fixed table layout

[tjwelde]

fixes KILTProtocol/ticket#1636

This PR proposes a layout change to a fixed table layout.
I changed the width of the input field, so that it looks more balanced.

Only the indicator column, the action column and the tokens column (at the far right) have fixed width. The rest of the width is distributed equally among the other columns.

How to test:

• Open/Close a collator row
• stake on a collator to set it active

Checklist:

• I have verified that the code works
• I have verified that the code is easy to understand
  • If not, I have left a well-balanced amount of inline comments
• I have left the code in a better state
• I have documented the changes (where applicable)

[Dudleyneedham]

When using the search collators the table completely breaks.

The tr.search seems to cause the issue CollatorsList.module.css line 31.

Additionally, it would be good to include the line for the staking to break up the information to clearly show different actions a user can use. I have a commit ready for this.

[tjwelde]

Ah, thanks. I will have a look.
Please include the commit here, or in another PR, as you wish.