Revert "Hide Vertical tab strip even when it's browser fullscreen"

[sangwoo108]

Reverts #19802

Fix brave/brave-browser#33106
Fix brave/brave-browser#33020

[sangwoo108]

Hi, @goodov . This would be new to you, but could you take a look at this? Simon is on PTO.

[simonhong]

++
It seems Simone is on PTO this week not me :)

[sangwoo108]

@simonhong Thanks! haha I thought it was you

[kjozwiak]

Verification PASSED on Win 11 x64 using the following build(s):

Brave | 1.60.37 Chromium: 117.0.5938.88 (Official Build) nightly (64-bit)
-- | --
Revision | d869c8860226f51bdef9f6a46f18f89cd2ae656c
OS | Windows 11 Version 22H2 (Build 22621.2283)

Basically ensure that vertical tabs are visible/usable when in Fullscreen Mode using F11. On Win, there's currently no way of viewing the horizontal tabs while in Fullscreen which is known and will be addressed in another fix.

• ensured that vertical tabs are visible and usable while you're in Fullscreen Mode

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Verification PASSED on macOS 13.5.2 x64 Ventura using the following build(s):

Brave | 1.60.38 Chromium: 117.0.5938.88 (Official Build) nightly (x86_64)
--- | ---
Revision | 89f7ea7a01a3ab15163916a9441c473ab1021372
OS | macOS Version 13.5.2 (Build 22G91)

Basically ensure that vertical tabs are visible/usable when in Fullscreen Mode using fn + f. Also ensured that horizontal tabs are also visible/usable as per the following:

Example	Example