HTML5: Enable mbedTLS module for Crypto object

Increases the size of the wasm by around 3% (~300-350 KiB).

This enables using the Crypto object for hashing, signing and encryption,
and therefore reduces the gap between the features of the HTML5 platform
and other platforms.

Closes https://github.com/godotengine/godot-proposals/issues/3574.

platform/javascript/detect.py

@@ -48,11 +48,6 @@ def get_flags():
     return [
         ("tools", False),
         ("builtin_pcre2_with_jit", False),
-        # Disabling the mbedtls module reduces file size.
-        # The module has little use due to the limited networking functionality
-        # in this platform. For the available networking methods, the browser
-        # manages TLS.
-        ("module_mbedtls_enabled", False),
         ("vulkan", False),
     ]