fix(modal): fix enter animation when the initial breakpoint value is less than the backdrop breakpoint

[OS-pedrolourenco]

Issue number: internal

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What is the current behavior?

This PR aims to fix an issue introduced in #29932 where the enter animation for ionic theme was in a broken state when the modal's initial breakpoint value was lesser than the specified backdrop breakpoint.

What is the new behavior?

• The erroneous behaviour happened because the shouldShowBackdrop constant had a false value which was being taken into consideration when computing the backdrop opacity for the ionic theme. This PR fixes this by always transitioning the backdrop opacity from 0 to 0.7 once the modal appears, independently of the initial, current or activation breakpoint.

Does this introduce a breaking change?

• Yes
• No

Other information

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Name	Status	Preview	Comments	Updated (UTC)
ionic-framework	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 22, 2024 1:54pm

[tanner-reits]

Confirmed the fix and update the PR title.

Only small feedback would be to add a comment to the backdropBreakpoint prop on the modal calling out that it is ignored for the ionic theme.

[thetaPC]

LGTM