fix(cli/ios): Configure initial view controller for the launch screen on iOS (#12538)

Co-authored-by: Fabian-Lars <github@fabianlars.de>

Author: DeTeam

.changes/launch-viewcontroller.md

@@ -0,0 +1,5 @@
+---
+tauri-cli: 'patch:bug'
+---
+
+Set initialViewController for LaunchScreen (iOS).

crates/tauri-cli/templates/mobile/ios/LaunchScreen.storyboard

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17150" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17150" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="Y6W-OH-hqX">
     <dependencies>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17122"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>