[iOS] Use correct suspension value for invalid language metrics answer (#30136)

This change ensures we use `Int32.max` instead of `Int.max` so that we match with desktop which uses `INT_MAX` to suspend the language metric

ios/brave-ios/Sources/Growth/LanguageMetrics.swift

@@ -206,7 +206,7 @@ public class LanguageMetrics {
   ]
 
   static func answerForLangaugeCode(_ languageCode: String?) -> Int {
-    let suspendedMetricValue = Int.max - 1
+    let suspendedMetricValue = Int(Int32.max - 1)
     guard let languageCode = languageCode,
       case let primaryLanguage = languageSynonyms[languageCode, default: languageCode],
       let answer = acceptedLanguages.firstIndex(of: primaryLanguage)

ios/brave-ios/Tests/GrowthTests/LangaugeMetricsTests.swift

@@ -10,7 +10,7 @@ import XCTest
 
 class LanguageMetricsTests: XCTestCase {
   func testInvalidLanguageCodes() {
-    let expectedValue = Int.max - 1
+    let expectedValue = Int(Int32.max - 1)
     XCTAssertEqual(LanguageMetrics.answerForLangaugeCode(nil), expectedValue)
     XCTAssertEqual(LanguageMetrics.answerForLangaugeCode("notalangugage"), expectedValue)
   }