Restrict play links to videos from ytdl / youtube

- others sadly cannot be played by mpv

server/templates/macros.htm

@@ -81,11 +81,14 @@
 {% endmacro %}
 
 {% macro as_play_link(element) -%}
-    {%- set opts = {
-        "video_uri": element.uri,
-        "start": element.progress,
-    } -%}
-    <a class="button" href="entertainment-decider:///player/play?{{ opts | encode_options }}">Play</a>
+    {# TODO do not hardcode certain extractors here #}
+    {% if element.extractor_name in ["ytdl", "youtube"] %}
+        {%- set opts = {
+            "video_uri": element.uri,
+            "start": element.progress,
+        } -%}
+        <a class="button" href="entertainment-decider:///player/play?{{ opts | encode_options }}">Play</a>
+    {% endif %}
 {%- endmacro -%}
 
 {% macro _navigation() %}