Revert "Disable Impeller when the manifest explicitly disables it (#53108)"

This reverts commit 8da25dc.

Author: auto-submit[bot]

shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java

@@ -340,10 +340,8 @@ public void ensureInitializationComplete(
       shellArgs.add("--prefetched-default-font-manager");
 
       if (metaData != null) {
-        if (metaData.getBoolean(ENABLE_IMPELLER_META_DATA_KEY, true)) {
+        if (metaData.getBoolean(ENABLE_IMPELLER_META_DATA_KEY, false)) {
           shellArgs.add("--enable-impeller");
-        } else {
-          shellArgs.add("--enable-impeller=false");
         }
         if (metaData.getBoolean(ENABLE_VULKAN_VALIDATION_META_DATA_KEY, false)) {
           shellArgs.add("--enable-vulkan-validation");