fix(ui5-select): align option font size with field (#11255)

Problem:
- The List Item was overriding the font size of select options.

Solution:
- Make dropdown options use the same font size as the select field by setting the parameter in the css file of the component.

Fixes: #11163

Author: NakataCode

packages/main/src/themes/OptionBase.css

@@ -1,3 +1,4 @@
 :host {
 	height: var(--_ui5_list_item_dropdown_base_height);
+	--_ui5_list_item_title_size: var(--sapFontSize);
 }