fix(es/codegen): Fix ends_with_alpha_num (#9720)

**Related issue:**

 - Closes #9719

Author: kdy1

.changeset/foo.md

@@ -0,0 +1,6 @@
+---
+swc_core: patch
+swc_ecma_codegen: patch
+---
+
+fix(es/codegen): Fix binary expression formatting

crates/swc_ecma_codegen/src/util.rs

@@ -70,7 +70,7 @@ impl EndsWithAlphaNum for Expr {
             Expr::Update(n) => n.prefix && n.arg.ends_with_alpha_num(),
 
             Expr::OptChain(n) => match n.base.as_ref() {
-                OptChainBase::Member(base) => base.prop.is_computed(),
+                OptChainBase::Member(base) => !base.prop.is_computed(),
                 OptChainBase::Call(_) => false,
             },