Allow fuzzy embedder test comparisons on macOS ARM as well

Fuzzy comparison tolerance, implemented in GetPlatformMaxPixelDelta(),
only tolerance minor differences on macOS x86. However, sometimes all
platforms render the same except macOS ARM, because it is the only ARM
platform being tested. To make fuzzy matching work for this situation,
change GetPlatformMaxPixelDelta() to tolerate minor differences on macOS
ARM as well.

Bug: 468228360
Change-Id: I41a99e41c5e22e4956da0aebef4f8ec1eb15a37d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/142590
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Andy Phan <andyphan@chromium.org>

testing/embedder_test.cpp

diff --git a/testing/embedder_test.cpp b/testing/embedder_test.cpp
index 1867a0e..be067ee 100644
--- a/testing/embedder_test.cpp
+++ b/testing/embedder_test.cpp
@@ -291,11 +291,11 @@
 }
 
 int GetPlatformMaxPixelDelta() {
-#if BUILDFLAG(IS_APPLE) && !defined(ARCH_CPU_ARM64)
+#if BUILDFLAG(IS_APPLE)
   return 1;
 #else
   return 0;
-#endif  // BUILDFLAG(IS_APPLE) && !defined(ARCH_CPU_ARM64)
+#endif  // BUILDFLAG(IS_APPLE)
 }
 
 std::string GetEmbedderTestExpectationPath(