egl/dri2: Fix typo in the previous commit

I didn't notice this due to a noobed piglit run.  It wasn't previously
noticed because the patch was only run on a driver that supported GLES3.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 0965959..351fbf4 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -742,7 +742,7 @@
          api = __DRI_API_GLES;
          break;
       case 2:
-         api = __DRI_API_GLES3;
+         api = __DRI_API_GLES2;
          break;
       case 3:
          api = __DRI_API_GLES3;