Fix qubes-run-terminal.desktop permissions

Should be 644, not 755

Fixes QubesOS/qubes-issues#4329

Makefile

@@ -236,7 +236,7 @@ install-common: install-doc
 	install -m 0755 misc/qubes-session-autostart $(DESTDIR)$(BINDIR)/qubes-session-autostart
 	install -m 0755 misc/qvm-features-request $(DESTDIR)$(BINDIR)/qvm-features-request
 	install -m 0755 misc/qubes-run-terminal $(DESTDIR)/$(BINDIR)
-	install -D -m 0755 misc/qubes-run-terminal.desktop $(DESTDIR)/$(APPLICATIONSDIR)/qubes-run-terminal.desktop
+	install -D -m 0644 misc/qubes-run-terminal.desktop $(DESTDIR)/$(APPLICATIONSDIR)/qubes-run-terminal.desktop
 	install -m 0755 qubes-rpc/qvm-sync-clock $(DESTDIR)$(BINDIR)/qvm-sync-clock
 	install qubes-rpc/{qvm-open-in-dvm,qvm-open-in-vm,qvm-copy-to-vm,qvm-run-vm} $(DESTDIR)/usr/bin
 	install qubes-rpc/qvm-copy $(DESTDIR)/usr/bin