Workbench: Use strip curve rendering during rendertests

This PR enables strip curve drawing when performing the workbench
rendertests. On Intel/vulkan the lines are to far off. Using strip will
reduce platform differences. Downside is that (basic) line rendering is not
covered anymore by a render test.

Pull Request: https://projects.blender.org/blender/blender/pulls/146820

tests/python/workbench_render_tests.py

@@ -41,6 +41,9 @@ def setup():
         scene.display.shading.light = 'STUDIO'
         scene.display.shading.color_type = 'TEXTURE'
 
+        # Hair
+        scene.render.hair_type = 'STRIP'
+
 
 # When run from inside Blender, render and exit.
 try: