[tests] Update EventLogsPipelineUnitTests referenced issue (#4905)

Some EventLogsPipelineUnitTests originally disabled for Windows began
failing on other platforms. They were additionally disabled for all
platforms, referencing issue
#4718.

#4718 was closed, opting to
use #2541 as the main
tracking issue.

Update the issue reference to reflect this.

src/tests/Microsoft.Diagnostics.Monitoring.EventPipe/EventLogsPipelineUnitTests.cs

@@ -68,14 +68,9 @@ public async Task TestLogsAllCategoriesAllLevels(TestConfiguration config)
         /// <summary>
         /// Test that log events at or above the default level are collected.
         /// </summary>
-        [SkippableTheory(Skip = "https://github.com/dotnet/diagnostics/issues/4718"), MemberData(nameof(Configurations))]
+        [SkippableTheory(Skip = "https://github.com/dotnet/diagnostics/issues/2541"), MemberData(nameof(Configurations))]
         public async Task TestLogsAllCategoriesDefaultLevel(TestConfiguration config)
         {
-            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-            {
-                throw new SkipTestException("https://github.com/dotnet/diagnostics/issues/2541");
-            }
-
             using Stream outputStream = await GetLogsAsync(config, settings => {
                 settings.UseAppFilters = false;
                 settings.LogLevel = LogLevel.Warning;
@@ -169,14 +164,9 @@ public async Task TestLogsUseAppFilters(TestConfiguration config)
         /// Test that log events are collected for the categories and levels specified by the application
         /// and for the categories and levels specified in the filter specs.
         /// </summary>
-        [SkippableTheory(Skip = "https://github.com/dotnet/diagnostics/issues/4718"), MemberData(nameof(Configurations))]
+        [SkippableTheory(Skip = "https://github.com/dotnet/diagnostics/issues/2541"), MemberData(nameof(Configurations))]
         public async Task TestLogsUseAppFiltersAndFilterSpecs(TestConfiguration config)
         {
-            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-            {
-                throw new SkipTestException("https://github.com/dotnet/diagnostics/issues/2541");
-            }
-
             using Stream outputStream = await GetLogsAsync(config, settings => {
                 settings.FilterSpecs = new Dictionary<string, LogLevel?>()
                 {