LibGL: Return GLboolean value in glIsEnabled

Author: https://github.com/gmta
Commit: 00b21fba57
Pull-request: https://github.com/SerenityOS/serenity/pull/15652
Reviewed-by: https://github.com/Quaker762
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/sunverwerth ✅

Userland/Libraries/LibGL/ContextParameter.cpp

@@ -615,7 +615,7 @@ GLboolean GLContext::gl_is_enabled(GLenum capability)
     auto parameter = optional_parameter.release_value();
     RETURN_VALUE_WITH_ERROR_IF(!parameter.is_capability, GL_INVALID_ENUM, 0);
 
-    return parameter.value.boolean_value;
+    return parameter.value.boolean_value ? GL_TRUE : GL_FALSE;
 }
 
 GPU::PackingSpecification GLContext::get_packing_specification(PackingType packing_type)