Copy removed.txt file to the snapshot correctly

Previously, the code copied the current.txt file to both the
current_api and removed_api properties. This change copies the
removed.txt file to the removed_api property instead.

Bug: 157980685
Test: m nothing
Change-Id: Iad34e91051da43222d22c240c16f50887c43d73e
diff --git a/java/sdk_library.go b/java/sdk_library.go
index c4d257f..67b0bd6 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -2083,7 +2083,7 @@
 
 			if properties.RemovedApiFile != nil {
 				removedApiSnapshotPath := filepath.Join(scopeDir, ctx.Name()+"-removed.txt")
-				ctx.SnapshotBuilder().CopyToSnapshot(properties.CurrentApiFile, removedApiSnapshotPath)
+				ctx.SnapshotBuilder().CopyToSnapshot(properties.RemovedApiFile, removedApiSnapshotPath)
 				scopeSet.AddProperty("removed_api", removedApiSnapshotPath)
 			}