update include path for SkBlurMask.h

fixes https://skia-review.googlesource.com/c/skia/+/113463

Bug: skia:
Change-Id: I78abc53bd802286e9fc65487551db17a2c737e1a
Reviewed-on: https://skia-review.googlesource.com/113715
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

src/gpu/effects/GrRectBlurEffect.fp

@@ -7,7 +7,7 @@
 
 @header {
     #include "GrProxyProvider.h"
-    #include "../effects/SkBlurMask.h"
+    #include "SkBlurMask.h"
 }
 
 in uniform float4 rect;

src/gpu/effects/GrRectBlurEffect.h

@@ -11,10 +11,10 @@
 #ifndef GrRectBlurEffect_DEFINED
 #define GrRectBlurEffect_DEFINED
 #include "SkTypes.h"
-#include "SkBlurMask.h"
 #if SK_SUPPORT_GPU
 
 #include "GrProxyProvider.h"
+#include "SkBlurMask.h"
 #include "GrFragmentProcessor.h"
 #include "GrCoordTransform.h"
 class GrRectBlurEffect : public GrFragmentProcessor {