[FIX] web: fix form view dropdown's buttons shifted on Edge
[FIX] web: fix form view dropdown's buttons shifted on Edge

In form views, there are stat buttons.

When the window size is too small, some buttons are packed into
a "More" dropdown.

Before this commit:

    - The form view dropdown's buttons are shifted on Microsoft Edge
      and IE 11.

After this commit:

    - The form view dropdown's buttons are not shifted anymore on
      Microsoft Edge and IE 11.

There was a fixed line-height on the button's icon. On Edge and IE 11,
it makes the icon moving down and this causes the offsetting.

The purpose of the line-height was to fix the button height to 44 pixels

So, I set up the button's height and centered the content.

Also, I removed a useless border-left because there was already one
border on the dropdown container.

OPW-2079694

closes odoo/odoo#39635

X-original-commit: a7d9f2a5a94662602a34f7e68e5cd0c4cd07c7f3
Signed-off-by: Jason Van Malder <35bd32c57c0c5fd64e02a1acdd25d0ec0304975b@users.noreply.github.com>

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