Remove the (deprecated) isOpaque parameter when making SkSL shaders

SkSL now deduces this, so the parameter does nothing, and is going away.

Bug: 217753125
Change-Id: I673537a9900b5d3219f3914b3b93e0b5e97329db
Test: Removal of unused parameter. Existing tests still pass.
diff --git a/libs/hwui/pipeline/skia/LayerDrawable.cpp b/libs/hwui/pipeline/skia/LayerDrawable.cpp
index 7c57bd5..2fba13c 100644
--- a/libs/hwui/pipeline/skia/LayerDrawable.cpp
+++ b/libs/hwui/pipeline/skia/LayerDrawable.cpp
@@ -98,7 +98,7 @@
         effectBuilder.uniform(uniform.name.c_str()).set(uniform.value.data(), uniform.value.size());
     }
 
-    return effectBuilder.makeShader(nullptr, false);
+    return effectBuilder.makeShader();
 }
 
 static bool isHdrDataspace(ui::Dataspace dataspace) {