fix absolute checks

Author: rjernst

libs/entitlement/src/main/java/org/elasticsearch/entitlement/runtime/policy/entitlements/FilesEntitlement.java

@@ -331,13 +331,13 @@ public static FilesEntitlement build(List<Object> paths) {
                 }
 
                 Path relativePath = Path.of(relativePathAsString);
-                if (platform != null && platform.isCurrent() && FileData.isAbsolutePath(relativePathAsString)) {
+                if (FileData.isAbsolutePath(relativePathAsString)) {
                     throw new PolicyValidationException("'relative_path' [" + relativePathAsString + "] must be relative");
                 }
                 fileData = FileData.ofRelativePath(relativePath, baseDir, mode);
             } else if (pathAsString != null) {
                 Path path = Path.of(pathAsString);
-                if (platform != null && platform.isCurrent() && FileData.isAbsolutePath(pathAsString) == false) {
+                if (FileData.isAbsolutePath(pathAsString) == false) {
                     throw new PolicyValidationException("'path' [" + pathAsString + "] must be absolute");
                 }
                 fileData = FileData.ofPath(path, mode);