Apply review suggestions (Fixes #2935)

Author: paolorotolo

features/dd-sdk-android-trace-otel/src/main/java/com/datadog/opentelemetry/trace/OtelSpanBuilder.java

@@ -151,10 +151,7 @@ public <T> SpanBuilder setAttribute(AttributeKey<T> key, @Nullable T value) {
                 }
                 break;
             case STRING:
-                if (!handleReservedAttribute(key.getKey(), (String) value)) {
-                    this.delegate.withTag(key.getKey(), value);
-                }
-                break;
+                return setAttribute(key.getKey(), (String) value);
             default:
                 this.delegate.withTag(key.getKey(), value);
                 break;