Remove redundant check for SUPPORT_BASE64_EMBEDDING in getWasmBinary. NFC (#23491)

This block of code is withing `!SINGLE_FILE` but
`SUPPORT_BASE64_EMBEDDING` is only ever defined when `SINGLE_FILE` is
enabled.

In the past I think `SUPPORT_BASE64_EMBEDDING` may have been defined
under more circumstances?

The codesize changes are just white-space only changes in the
un-optimized output.

Author: sbc100

src/preamble.js

@@ -627,11 +627,7 @@ function getBinarySync(file) {
 async function getWasmBinary(binaryFile) {
 #if !SINGLE_FILE
   // If we don't have the binary yet, load it asynchronously using readAsync.
-  if (!wasmBinary
-#if SUPPORT_BASE64_EMBEDDING
-      || isDataURI(binaryFile)
-#endif
-      ) {
+  if (!wasmBinary) {
     // Fetch the binary using readAsync
     try {
       var response = await readAsync(binaryFile);

test/other/test_unoptimized_code_size.js.size

@@ -1 +1 @@
-52739
+52732

test/other/test_unoptimized_code_size_no_asserts.js.size

@@ -1 +1 @@
-28487
+28480

test/other/test_unoptimized_code_size_strict.js.size

@@ -1 +1 @@
-51522
+51515