Fixed compile error caused by I7ed2b9bb7

Change-Id: Ibde426093bc067a4c570c3b9a370f564829f3468

Author: Stewart Miles

source/AndroidResolver/src/JavaUtilities.cs

@@ -54,7 +54,7 @@ public ToolNotFoundException(string message) : base(message) {}
         /// </summary>
         internal static string JavaHome {
             get {
-                var javaHome = null;
+                string javaHome = null;
                 // Unity 2019.3 added AndroidExternalToolsSettings which contains the JDK path so
                 // try to use that first.
                 var javaRootPath = UnityCompat.AndroidExternalToolsSettingsJdkRootPath;