Fix missing EGL prefix in EGL_EXT_device_drm_render_node name string (#221)

extensions/EXT/EGL_EXT_device_drm_render_node.txt

diff --git a/extensions/EXT/EGL_EXT_device_drm_render_node.txt b/extensions/EXT/EGL_EXT_device_drm_render_node.txt
index 4c08844..060418f 100644
--- a/extensions/EXT/EGL_EXT_device_drm_render_node.txt
+++ b/extensions/EXT/EGL_EXT_device_drm_render_node.txt
@@ -4,7 +4,7 @@
 
 Name Strings
 
-    EXT_device_drm_render_node
+    EGL_EXT_device_drm_render_node
 
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