Revert "Always tweak matrix for consistent opt"

This reverts commit 26e1073.

Reason for revert: breaking google3?

Original change's description:
> Always tweak matrix for consistent opt
>
> Change-Id: Id16d4c4831724571dc0b1bd5d99e8a93b2a88ea9
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/337724
> Reviewed-by: Mike Klein <mtklein@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=mtklein@google.com,reed@google.com

Change-Id: I6200dc3478863e50d4995da952e5c35686efc42a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/337939
Reviewed-by: Mike Reed <reed@google.com>

Author: reed-at-google

src/shaders/SkImageShader.cpp

@@ -920,7 +920,13 @@ skvm::Color SkImageShader::onProgram(skvm::Builder* p,
         if (lowerWeight > 0) {
             lower = &access->lowerLevel();
         }
-        tweak_filter_and_inv_matrix(&sampling.fFilter, &upperInv);
+
+        // should we do this all the  time (not use in UseSampling?)
+        if (!fUseSamplingOptions) {
+            if (!sampling.fUseCubic) {
+                tweak_filter_and_inv_matrix(&sampling.fFilter, &upperInv);
+            }
+        }
     }
 
     skvm::Coord upperLocal = SkShaderBase::ApplyMatrix(p, upperInv, origLocal, uniforms);