Fix: Font size select value mismatch

[Takshil-Kunadia]

Fixes: #67283

What?

The selected value gets updated in the font select after the next iteration. Thus leading to a lag in the correct value being displayed on the selector.

Why?

The state in store.getState() is updated after the setValue logic is completed. This results in the currentValue being out of sync with the state during the render cycle.

How?

There is no need for the current value to be fetched from the store created when we have the current value available as a prop. This PR makes the change of using that value directly instead of waiting for the store's value to be set and then fetch it.

Testing Instructions

1. In local set-up, Open twentytwentyfive's theme.json. [ I have used this theme for demo, WP 6.8rc ].
2. In the fontSizes object ( settings -> typography -> fontSizes ), add the following objects at the end.

				{
					"fluid": {
						"max": "4rem",
						"min": "3.2rem"
					},
					"name": "Extra Extra Extra Large",
					"size": "3.2rem",
					"slug": "xxx-large"
				},
				{
					"fluid": {
						"max": "5rem",
						"min": "4.2rem"
					},
					"name": "Extra Extra Extra Extra Large",
					"size": "4.2rem",
					"slug": "xxxx-large"
				}

3. Open Global styles in site editor, and look for typography -> headings.
4. Check the font size select drop down displaying the correct values for all the different headings selected.

Screenshots or screencast

Screen.Recording.2024-11-26.at.4.46.47.PM.mov

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Co-authored-by: Takshil-Kunadia <[email protected]>
Co-authored-by: carolinan <[email protected]>
Co-authored-by: SainathPoojary <[email protected]>
Co-authored-by: mikemcalister <[email protected]>

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