[build_web_compilers] Fix WebAssembly detection logic (#3931)

Fixes #3930

Author: kevmoo

build_web_compilers/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 4.1.3
+
+- Fixed WebAssembly detection logic.
+
 ## 4.1.2
 
 - Bump the min SDK to 3.7.0.

build_web_compilers/lib/src/web_entrypoint_builder.dart

@@ -390,7 +390,7 @@ function relativeURL(ref) {
           dart2WasmResult?.supportExpression ??
           "'WebAssembly' in self && "
               'WebAssembly.validate(new Uint8Array('
-              '[0, 97, 115, 109, 1, 0, 0, 0, 1, 5, 1, 95, 1, 120, 0]));';
+              '[0, 97, 115, 109, 1, 0, 0, 0, 1, 5, 1, 95, 1, 120, 0]))';
 
       loaderResult.writeln('''
 if ($supportCheck) {

build_web_compilers/pubspec.yaml

@@ -1,5 +1,5 @@
 name: build_web_compilers
-version: 4.1.2
+version: 4.1.3
 description: Builder implementations wrapping the dart2js and DDC compilers.
 repository: https://github.com/dart-lang/build/tree/master/build_web_compilers
 resolution: workspace