Fix logic error in GrProcessorSet::dumpProcessors.

I broke this during the refactor, at http://review.skia.org/304857

Change-Id: I9f16acd05fbb3767eed59810a1b1a8a110ce29d4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/309878
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>

src/gpu/GrProcessorSet.cpp

@@ -58,7 +58,7 @@ SkString GrProcessorSet::dumpProcessors() const {
     } else {
         result.append("No color fragment processor.\n");
     }
-    if (this->hasColorFragmentProcessor()) {
+    if (this->hasCoverageFragmentProcessor()) {
         result.append("Coverage Fragment Processor:\n");
         result += this->coverageFragmentProcessor()->dumpTreeInfo();
     } else {