Set m_is_static=false as default in decoder

Author: wine99

ggml/src/ggml-openvino/ggml-decoder.h

@@ -161,7 +161,7 @@ class GgmlOvDecoder : public ov::frontend::ggml::GgmlDecoder {
     int m_head_size;
     int32_t* m_rope_params;
     std::vector<std::string> m_kv_names;
-    bool m_is_static;
+    bool m_is_static = false;
     bool m_is_first_token;
 };