Compile RHS of binary expressions (oopsie)

Not sure how this happened besides being a gigantic moron, I completely
forgot to do `self.compile_expr(&expr.rhs)`.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/compiler.rs

@@ -796,6 +796,8 @@ impl ExprVisitor for Compiler<'_> {
         let constant_id = self.insert_constant(self.create_str(name))?;
         self.emit(expr_line_number(expr), Op::GetAttr(constant_id));
 
+        self.compile_expr(&expr.rhs)?;
+
         // convert RHS to a bool if we're doing AND or OR
         if let TokenKind::And | TokenKind::Or = expr.op.kind {
             let constant_id = self.insert_constant(self.create_str("to_bool"))?;