UPBGE: Fix alpha blending settings for geometry instancing and batching.

Previously the alpha blending were set only for geometry instancing and batching
only if the shader was overrided, but the alpha blending should be always set
because the the material is not setting it due to the lack of call to ActivateMeshSlot.

source/gameengine/Rasterizer/RAS_DisplayArrayBucket.cpp

@@ -378,11 +378,6 @@ void RAS_DisplayArrayBucket::RunInstancingNode(const RAS_RenderNodeArguments& ar
 			m_instancingBuffer->GetMatrixOffset(),
 			m_instancingBuffer->GetPositionOffset(),
 			m_instancingBuffer->GetStride());
-
-		/* Because the geometry instancing use setting for all instances we use the original alpha blend.
-		 * This requierd that the user use "alpha blend" mode if he will mutate object color alpha.
-		 */
-		rasty->SetAlphaBlend(material->GetAlphaBlend());
 	}
 	else {
 		material->ActivateInstancing(
@@ -393,6 +388,11 @@ void RAS_DisplayArrayBucket::RunInstancingNode(const RAS_RenderNodeArguments& ar
 			m_instancingBuffer->GetStride());
 	}
 
+	/* Because the geometry instancing use setting for all instances we use the original alpha blend.
+	 * This requierd that the user use "alpha blend" mode if he will mutate object color alpha.
+	 */
+	rasty->SetAlphaBlend(material->GetAlphaBlend());
+
 	/* It's a major issue of the geometry instancing : we can't manage face wise.
 	 * To be sure we don't use the old face wise we force it to true. */
 	rasty->SetFrontFace(true);
@@ -453,12 +453,10 @@ void RAS_DisplayArrayBucket::RunBatchingNode(const RAS_RenderNodeArguments& args
 	RAS_IRasterizer *rasty = args.m_rasty;
 	RAS_IPolyMaterial *material = m_bucket->GetPolyMaterial();
 
-	if (args.m_shaderOverride) {
-		/* Because the batching use setting for all instances we use the original alpha blend.
-		 * This requierd that the user use "alpha blend" mode if he will mutate object color alpha.
-		 */
-		rasty->SetAlphaBlend(material->GetAlphaBlend());
-	}
+	/* Because the batching use setting for all instances we use the original alpha blend.
+	 * This requierd that the user use "alpha blend" mode if he will mutate object color alpha.
+	 */
+	rasty->SetAlphaBlend(material->GetAlphaBlend());
 
 	/* It's a major issue of the batching : we can't manage face wise per object.
 	 * To be sure we don't use the old face wise we force it to true. */