Fix permissions and #! lines for some tests in the upstream build system

d/rules: remove workarounds for script permissions.
The upstream build system now uses the intended permissions throughout.

Retain explicit chmod for *.js, which dh_fixperms assumes should not be executable.

debian/rules

@@ -25,8 +25,6 @@ override_dh_auto_configure:
 		--with-grub2-mkconfig-path=/usr/sbin/grub-mkconfig \
 		--with-systemdsystemunitdir=/lib/systemd/system \
 		$(NULL)
-	chmod +x tests/*.js
-	chmod +x tests/*.sh
 
 override_dh_auto_test:
 	debian/test.sh
@@ -63,12 +61,10 @@ override_dh_makeshlibs:
 	dh_makeshlibs -Xinstalled-tests/ostree/libreaddir-rand.so
 
 override_dh_fixperms-arch:
+	# dh_fixperms assumes *.js are for browsers and makes them 0644.
 	dh_fixperms -X'*.js'
-	chmod -v 0755 debian/ostree-tests/usr/lib/installed-tests/ostree/*.js
-	chmod -v 0755 debian/ostree-tests/usr/lib/installed-tests/ostree/*.py
-	chmod -v 0755 debian/ostree-tests/usr/lib/installed-tests/ostree/*.sh
-	# this one is a library, not a script
-	chmod -v 0644 debian/ostree-tests/usr/lib/installed-tests/ostree/libtest.sh
+	find debian/tmp -type f -name '*.js' -print0 | \
+		xargs -0r chmod -v go=rX,u+rw,a-s
 
 override_dh_systemd_start:
 	dh_systemd_start --no-start