Fix compile problems in JavaScript class

extractor/src/main/java/org/schabi/newpipe/extractor/utils/JavaScript.java

@@ -10,31 +10,25 @@ public final class JavaScript {
     }
 
     public static void compileOrThrow(final String function) {
-        try {
+        try (Context context = Context.enter()) {
-            final Context context = Context.enter();
+            context.setInterpretedMode(true);
-            context.setOptimizationLevel(-1);
 
             // If it doesn't compile it throws an exception here
             context.compileString(function, null, 1, null);
-        } finally {
-            Context.exit();
         }
     }
 
     public static String run(final String function,
                              final String functionName,
                              final String... parameters) {
-        try {
+        try (Context context = Context.enter()) {
-            final Context context = Context.enter();
+            context.setInterpretedMode(true);
-            context.setOptimizationLevel(-1);
             final ScriptableObject scope = context.initSafeStandardObjects();
 
             context.evaluateString(scope, function, functionName, 1, null);
             final Function jsFunction = (Function) scope.get(functionName, scope);
             final Object result = jsFunction.call(context, scope, scope, parameters);
             return result.toString();
-        } finally {
-            Context.exit();
         }
     }