Fix low_bandwidth_audio_perf_test gn group definition on windows.

This is a forward fix for https://webrtc-review.googlesource.com/c/src/+/256862.
Current run have the below error:
https://logs.chromium.org/logs/webrtc/buildbucket/cr-buildbucket/8818456476112979761/+/u/generate_build_files/stdout

The code is copied from Chromium:
https://crsrc.org/c/chrome/test/BUILD.gn;l=4540;bpv=1;bpt=0;drc=f63ec863909167deb96888769776621767a99fa2

Bug: webrtc:13867
No-Try: True
Change-Id: Idf4d3bf4acde66d4c48ecc9b5aa2053c7a82f033
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256963
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Cr-Commit-Position: refs/heads/main@{#36358}

audio/BUILD.gn

@@ -285,7 +285,11 @@ if (rtc_include_tests) {
         data += [ "../tools_webrtc/audio_quality/mac/pesq" ]
       }
 
-      write_runtime_deps = "${root_out_dir}/${target_name}.runtime_deps"
+      if (is_win) {
+        write_runtime_deps = "${root_out_dir}/${target_name}.exe.runtime_deps"
+      } else {
+        write_runtime_deps = "${root_out_dir}/${target_name}.runtime_deps"
+      }
     }
   }