Fix broken desktop build

[simoarpe]

Related to brave/brave-core#20635

Description

../../brave/browser/ui/webui/brave_wallet/wallet_page_ui.cc(82,11): error: call to member function 'AddString' is ambiguous
   82 |   source->AddString("isAndroid", false);
      |   ~~~~~~~~^~~~~~~~~
../..\content/public/browser/web_ui_data_source.h(52,16): note: candidate function
   52 |   virtual void AddString(base::StringPiece name,
      |                ^
../..\content/public/browser/web_ui_data_source.h(56,16): note: candidate function
   56 |   virtual void AddString(base::StringPiece name, const std::string& value) = 0;

Additional information

Solution:

diff --git a/browser/ui/webui/brave_wallet/wallet_page_ui.cc b/browser/ui/webui/brave_wallet/wallet_page_ui.cc
index 4776e95ac0..6151d95bd1 100644
--- a/browser/ui/webui/brave_wallet/wallet_page_ui.cc
+++ b/browser/ui/webui/brave_wallet/wallet_page_ui.cc
@@ -79,7 +79,7 @@ WalletPageUI::WalletPageUI(content::WebUI* web_ui)
   source->AddString("braveWalletNftBridgeUrl", kUntrustedNftURL);
   source->AddString("braveWalletLineChartBridgeUrl", kUntrustedLineChartURL);
   source->AddString("braveWalletMarketUiBridgeUrl", kUntrustedMarketURL);
-  source->AddString("isAndroid", false);
+  source->AddBoolean("isAndroid", false);
   source->AddBoolean(brave_wallet::mojom::kP3ACountTestNetworksLoadTimeKey,
                      base::CommandLine::ForCurrentProcess()->HasSwitch(
                          brave_wallet::mojom::kP3ACountTestNetworksSwitch));