Fix typo when multiple BootImageProfiles specified

cat needs a redirect to the output file.

Test: m checkbuild
Change-Id: I7f39048a3e0aa85fa7ce826bfb811e4ce5aa3277
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 05868da..8853428 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -399,7 +399,7 @@
 	var bootImageProfile string
 	if len(info.global.BootImageProfiles) > 1 {
 		combinedBootImageProfile := info.dir.Join(ctx, "boot-image-profile.txt")
-		rule.Command().Text("cat").Inputs(info.global.BootImageProfiles).Output(combinedBootImageProfile.String())
+		rule.Command().Text("cat").Inputs(info.global.BootImageProfiles).Text(">").Output(combinedBootImageProfile.String())
 		bootImageProfile = combinedBootImageProfile.String()
 	} else {
 		bootImageProfile = info.global.BootImageProfiles[0]