Undo filtering of HOME environment variable.

It an cause 'nonexistent' user errors in the sandbox.

Bug: 363037195
Change-Id: I5e17fa62029ba9bcd2422fa9aebef95223c68c0d
diff --git a/ui/build/config.go b/ui/build/config.go
index 711f325..08e1957 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -351,9 +351,6 @@
 
 		// Use config.useN2 instead.
 		"SOONG_USE_N2",
-
-		// Leaks usernames into environment.
-		"HOME",
 	)
 
 	if ret.UseGoma() || ret.ForceUseGoma() {