fix: fix the logic for the UNDICI_NO_WASM_SIMD environment variable (#5026)

Author: ShenHongFei

lib/dispatcher/client-h1.js

@@ -69,9 +69,9 @@ function lazyllhttp () {
   let useWasmSIMD = process.arch !== 'ppc64'
   // The Env Variable UNDICI_NO_WASM_SIMD allows explicitly overriding the default behavior
   if (process.env.UNDICI_NO_WASM_SIMD === '1') {
-    useWasmSIMD = true
-  } else if (process.env.UNDICI_NO_WASM_SIMD === '0') {
     useWasmSIMD = false
+  } else if (process.env.UNDICI_NO_WASM_SIMD === '0') {
+    useWasmSIMD = true
   }
 
   if (useWasmSIMD) {