pw_span: Fix test's remove_configs

Fixes up the test target's remove_configs to remove the
extra_strict_warnings NOT strict_warnings.

Change-Id: I1864193236ca45e171ba9294d415418d968c2756
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/22002
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
diff --git a/pw_span/BUILD.gn b/pw_span/BUILD.gn
index d26c01c..4a1f9ff 100644
--- a/pw_span/BUILD.gn
+++ b/pw_span/BUILD.gn
@@ -38,7 +38,7 @@
 
 pw_test("test") {
   deps = [ ":pw_span" ]
-  remove_configs = [ "$dir_pw_build:strict_warnings" ]
+  remove_configs = [ "$dir_pw_build:extra_strict_warnings" ]
   sources = [ "span_test.cc" ]
 }