fix: prevent creating new tab when openInNewTab is not set

[edongashi]

Fixes #634, #583, #530, #401, #338.

As per API docs:

If newLeaf is false (or not set) then an existing leaf which can be navigated
is returned, or a new leaf will be created if there was no leaf available.

Note that settings must be enhanced to support an additional state (option 3):

1. Current tab (when open in new tab is unchecked) - fixed in this PR
2. New tab with split (vertical/horizontal) - exists
3. New tab without split - handled if direction is not set. Current settings do not support this.

I guess most people would like 1 and 3. 2 is a bit niche, as splits are annoying.

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Name	Status	Preview	Updated (UTC)
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[JayPritchet]

Hi, It seems the changes in your commit will not achieve the goal.

I tested your code, it will close the opened file in current active tab, and then open the desired file in the same tab.

I created a new pr, it will check if there is an exsiting tab that already opened the file. If true, it will switch to that tab, otherewise it will created a new tab and focus on it.