[Fix] (DirectGLES): exact transform feedback primitive queries

Two leftovers from the capture passthrough, both only observable with a
geometry shader in the pipeline:

- GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN / GL_PRIMITIVES_GENERATED fell back
  to the frontend's CPU accounting, which counts the primitives the draw call
  assembles and so cannot see a geometry stage's amplification. Both are core ES
  query targets (GL_PRIMITIVES_GENERATED from 3.2 on, gated accordingly so an
  older driver doesn't get a stray GL_INVALID_ENUM), so they now go straight to
  the driver's own counters. Generalized the occlusion-query handle's isOcclusion
  flag into the glBeginQuery target it already had to remember for glEndQuery,
  which is what tells the result read to use the core 32-bit getter.

- FixupGsStripCaptureOrder rewrites captured strip triangles from Vulkan's
  (i, i+1, i+2) order into GL's (i+1, i, i+2). A driver-side capture already
  emits GL order, so the rewrite corrupted it - KHR-GL33.transform_feedback
  .geometry read back the odd triangle rotated one vertex. Skipped when the
  backend owns the capture span.

KHR-GL3{0,1,2,3}.transform_feedback is now 21/21 on Espryt; DirectVulkan
(lavapipe) re-verified at 21/21 for the shared frontend change.

MobileGL/MG_Backend/DirectGLES/BackendObject_DirectGLES.cpp

@@ -942,6 +942,10 @@ namespace MobileGL::MG_Backend::DirectGLES {
             // when the timer-query group above is disabled.
             funcsTable.GL.BeginOcclusionQuery = BeginOcclusionQuery;
             funcsTable.GL.EndOcclusionQuery = EndOcclusionQuery;
+            // Real driver primitive counters: the frontend's CPU accounting cannot see a
+            // geometry shader's amplification.
+            funcsTable.GL.BeginXfbPrimitivesQuery = BeginXfbPrimitivesQuery;
+            funcsTable.GL.EndXfbPrimitivesQuery = EndXfbPrimitivesQuery;
             funcsTable.GL.IsQueryResultAvailable = IsQueryResultAvailable;
             funcsTable.GL.GetQueryResult64 = GetQueryResult64;
             funcsTable.GL.DeleteBackendQuery = DeleteBackendQuery;