allow to hide the tabs closing button

[Yukulélé]

I, like many peoples, never use close tab button:

• I use left click to select tab
• I use middle click to close tab (or ctrl+w)
• Sometimes I accidentally close a tab when trying to select it by clicking the close button by mistake
• close button take useless space to the tab title

I suggest to add an option to hide the close tabs button.

[Jon]

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