Fix static-files RTC foci detection

roles/custom/matrix-static-files/defaults/main.yml

@@ -210,7 +210,7 @@ matrix_static_files_file_matrix_client_property_cc_etke_ketesa_custom: {}
 #
 # Controls whether `org.matrix.msc4143.rtc_foci`-related entries should be added to the client well-known.
 # By default, if there are entries in `matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci`, we show them (by enabling this).
-matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci_enabled: "{{ matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci | default({}) | dict2items | length > 0 }}"
+matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci_enabled: "{{ matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci | default([]) | length > 0 }}"
 
 # Controls the org.matrix.msc4143.rtc_foci property in the /.well-known/matrix/client file.
 # See `matrix_static_files_file_matrix_client_property_org_matrix_msc4143_rtc_foci_enabled`