Fix function call expressions

examples/test.lua

@@ -4,5 +4,4 @@ function add(x)
     end
 end
 
-local d = add(5)
-global c = print(d(7))
+global c = print(add(5)(7))

src/ast.rs

@@ -344,7 +344,7 @@ impl Parse for PrimaryExpression {
             Expression::ValueRef(stream.parse()?)
         };
 
-        if let Some(Token::Symbol('(')) = stream.peek() {
+        while let Some(Token::Symbol('(')) = stream.peek() {
             stream.next();
             let expression_list = stream.parse::<Node<ExpressionList>>()?;
             stream.expect(Token::Symbol(')'))?;