scripts: Initialize renderdoc environment

In some cases this seems to be required to avoid issues with X11
display connections.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>

scripts/renderdoc_dump_images.py

@@ -81,6 +81,7 @@ def loadCapture(filename):
     return (cap, controller)
 
 def renderdoc_dump_images(filename, eventIds, outputDir):
+   rd.InitGlobalEnv(rd.GlobalEnvironment(), [])
    cap,controller = loadCapture(filename);
 
    tracefile = Path(filename).name