Fix missed tracing line; convert to if constexpr

Change-Id: I67d3e9e43ca3985acf6552a8f2edbbcf5f1abad4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/544236
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>

src/text/gpu/TextBlob.cpp

@@ -2766,9 +2766,9 @@ bool SkGlyphRunListPainter::CategorizeGlyphRunList(const SkGlyphRunList& glyphRu
             auto [strikeSpec, strikeToSourceScale] =
                     SkStrikeSpec::MakePath(runFont, runPaint, deviceProps, scalerContextFlags);
 
-            #if defined(SK_TRACE_GLYPH_RUN_PROCESS)
+            if constexpr (kTrace) {
                 msg.appendf("  Path case:\n%s", strikeSpec.dump().c_str());
-            #endif
+            }
 
             if (!SkScalarNearlyZero(strikeToSourceScale)) {
                 SkScopedStrikeForGPU strike = strikeSpec.findOrCreateScopedStrike(strikeCache);