Remove isSourceDump from PathForVndkRefAbiDump()

This commit removes `isSourceDump` from `PathForVndkRefAbiDump()`
because the binary dump paths are not being used at all.

Test: lunch aosp_arm64_ab-userdebug && make
Change-Id: I7a6bb9053a6b052590fb1152982949fee897df8d
diff --git a/cc/library.go b/cc/library.go
index e92cf9d..377be41 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -649,7 +649,7 @@
 		exportedHeaderFlags := strings.Join(SourceAbiFlags, " ")
 		library.sAbiOutputFile = TransformDumpToLinkedDump(ctx, objs.sAbiDumpFiles, soFile, fileName, exportedHeaderFlags)
 
-		refSourceDumpFile := android.PathForVndkRefAbiDump(ctx, vndkVersion, fileName, vndkVsNdk(ctx), true)
+		refSourceDumpFile := android.PathForVndkRefAbiDump(ctx, vndkVersion, fileName, vndkVsNdk(ctx))
 		if refSourceDumpFile.Valid() {
 			unzippedRefDump := UnzipRefDump(ctx, refSourceDumpFile.Path(), fileName)
 			library.sAbiDiff = SourceAbiDiff(ctx, library.sAbiOutputFile.Path(),