Revert^2 "Make embedded_launcher true by default"

This reverts commit 578066be90d3e1960c02b5c80c29e92bca70a70b.

Reason for revert: Relanding

Change-Id: I63f01362cc11c02c4800ae1c21652c7cf4b8a799
diff --git a/python/python.go b/python/python.go
index d3cbd76..3551eb6 100644
--- a/python/python.go
+++ b/python/python.go
@@ -59,7 +59,7 @@
 	// list of the Python libraries used only for this Python version.
 	Libs []string `android:"arch_variant"`
 
-	// whether the binary is required to be built with embedded launcher for this version, defaults to false.
+	// whether the binary is required to be built with embedded launcher for this version, defaults to true.
 	Embedded_launcher *bool // TODO(b/174041232): Remove this property
 }