Bug 1151827 - Fix re-building toolkit/mozapps/update on Windows. r=rstrong

Test plan:
- On Windows, run `./mach clobber`
- On Windows, run `./mach build`, make sure it succeeds
- On Windows, run `./mach build toolkit/mozapps/update/updater` make sure it succeeds

toolkit/mozapps/update/updater/updater-xpcshell/Makefile.in

@@ -35,8 +35,8 @@ ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
 	# Copy for mochitest chrome tests
 	rsync -a -C $(XPCSHELLTESTROOT)/data/updater.app $(MOCHITESTROOT)/data/updater.app
 else
-	mv $(PROGRAM) $(XPCSHELLTESTROOT)/data/updater$(BIN_SUFFIX)
-	cp $(XPCSHELLTESTROOT)/data/updater$(BIN_SUFFIX) $(MOCHITESTROOT)/data/updater$(BIN_SUFFIX)
+	cp $(PROGRAM) $(XPCSHELLTESTROOT)/data/updater$(BIN_SUFFIX)
+	cp $(PROGRAM) $(MOCHITESTROOT)/data/updater$(BIN_SUFFIX)
 endif
 
 CXXFLAGS += $(MOZ_BZ2_CFLAGS)