[FIX] web: oe-view-manager-content display issue on ie11

This tries to be the smallest patch possible in order to avoid triggering
another display issues, so we only patch in the ms-hight-contrast section
which only applies on ie 10/11.

* The view-manager weren't displayed correctly; they didn't fit 100% of
  the screen width. This is fixed by explicitely seting the top, right,
  left, bottom attributes.

* The modals content were not displayed. This was due to 2 issues:
  * The rule that we patch in the first point set the position of
    `oe-view-manager` as absolute with an importang flag. Because of
    this important, the rule that reset the position of the
    `oe-view-manager` as static in modals.less was not honored. So
    we also patch this rule with an important flag inside the same
    file (so that all the fixes related to ie10/11 are in the same
    place).
  * Now that the modals are displayed, they do not fit 100% of the
    screen. It's because the `max-height: 100%` of `.modal-content`
    set in modals.less does not work in ie10/11, due to some bug
    with the flex displays. We set the height to 450px so that the
    modals are kind of correctly displayed on a 1366x768 screen
    (their content are still scrollable).

related to rev 1ccd87a03753c69a2e12c585de388434ef9ff557
closes #12929

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