[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_Impl/GLImpl/Drawing/GL_Drawing.cpp

@@ -590,6 +590,12 @@ namespace MobileGL::MG_Impl::GLImpl {
     // vertex records of every odd triangle within each emitted strip.
     static void FixupGsStripCaptureOrder(const SharedPtr<MG_State::GLState::ProgramObject>& program,
                                          Uint64 inputPrimitives) {
+        // Only Vulkan-order captures need this. A backend that runs the capture on its
+        // own GL/ES driver (it owns the span, hence the EndTransformFeedback entry) has
+        // already produced GL's vertex order, and reordering it again would corrupt it.
+        if (MG_Backend::gBackendFunctionsTable.GL.EndTransformFeedback != nullptr) {
+            return;
+        }
         if (program == nullptr || !program->HasGsTriangleStripCaptureFixup() || inputPrimitives == 0) {
             return;
         }