PEL: Removed unused includes

The clangd LSP indicates when includes aren't used directly.

Tested:
Unit tests pass.

Change-Id: I8290fe59abd1cef4fada27aeb5adb2c45c289abb
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/extensions/openpower-pels/manager.cpp b/extensions/openpower-pels/manager.cpp
index 4cf17e6..ad69720bf 100644
--- a/extensions/openpower-pels/manager.cpp
+++ b/extensions/openpower-pels/manager.cpp
@@ -20,6 +20,7 @@
 #include "json_utils.hpp"
 #include "pel.hpp"
 #include "pel_entry.hpp"
+#include "pel_values.hpp"
 #include "service_indicators.hpp"
 #include "severity.hpp"
 
@@ -33,7 +34,6 @@
 #include <filesystem>
 #include <format>
 #include <fstream>
-#include <locale>
 
 namespace openpower
 {