fix(tempvoice): add permission overwrites for temporary voice channel owners

tempvoice.py

@@ -479,10 +479,18 @@ class TempVoice(commands.Cog):
             await self._remove_mapping_by_owner(guild, member.id)
 
         channel_name = self._safe_voice_name(member.display_name or member.name, member.id)
+        owner_overwrite = discord.PermissionOverwrite(
+            view_channel=True,
+            manage_channels=True,
+            connect=True,
+            speak=True,
+            stream=True,
+        )
         try:
             new_channel = await guild.create_voice_channel(
                 name=channel_name,
                 category=target_category,
+                overwrites={member: owner_overwrite},
                 reason="TempVoice: create temporary voice for {} ({})".format(member, member.id),
             )
         except discord.Forbidden: