fix(firestore, ios): fix an issue where unlimited cache wasn't properly set on iOS (#17412)

Author: Lyokone

packages/cloud_firestore/cloud_firestore/ios/cloud_firestore/Sources/cloud_firestore/FLTFirebaseFirestorePlugin.m

@@ -224,9 +224,8 @@ - (FIRFirestore *_Nullable)getFIRFirestoreFromAppNameFromPigeon:
     if (pigeonApp.settings.persistenceEnabled != nil) {
       bool persistEnabled = [pigeonApp.settings.persistenceEnabled boolValue];
 
-      // This is the maximum amount of cache allowed. We use the same number on android.
-      // This now causes an exception: kFIRFirestoreCacheSizeUnlimited
-      NSNumber *size = @104857600;
+      // We default to the maximum amount of cache allowed.
+      NSNumber *size = @(kFIRFirestoreCacheSizeUnlimited);
 
       if (pigeonApp.settings.cacheSizeBytes) {
         NSNumber *cacheSizeBytes = pigeonApp.settings.cacheSizeBytes;

packages/cloud_firestore/cloud_firestore/ios/cloud_firestore/Sources/cloud_firestore/FLTFirebaseFirestoreReader.m

@@ -104,9 +104,8 @@ - (FIRFirestoreSettings *)FIRFirestoreSettings {
   if (![values[@"persistenceEnabled"] isEqual:[NSNull null]]) {
     bool persistEnabled = [((NSNumber *)values[@"persistenceEnabled"]) boolValue];
 
-    // This is the maximum amount of cache allowed. We use the same number on android.
-    // This now causes an exception: kFIRFirestoreCacheSizeUnlimited
-    NSNumber *size = @104857600;
+    // We default to the maximum amount of cache allowed.
+    NSNumber *size = @(kFIRFirestoreCacheSizeUnlimited);
 
     if (![values[@"cacheSizeBytes"] isEqual:[NSNull null]]) {
       NSNumber *cacheSizeBytes = ((NSNumber *)values[@"cacheSizeBytes"]);