Remove name attribute in icmp-block-inversion

Firewalld does not parse the name attribute.

Log message:
firewalld[1999]: ERROR: Failed to load zone file 'public.xml':
PARSE_ERROR: icmp-block-inversion: Unexpected attribute name

firewalld/files/zone.xml

@@ -56,8 +56,8 @@
   <icmp-block name="{{ v }}" />
   {%- endfor %}
 {%- endif %}
-{%- if 'icmp_block_inversion' in zone %}
-  <icmp-block-inversion name="{{ zone.icmp_block_inversion }}" />
+{%- if 'icmp_block_inversion' in zone and zone.icmp_block_inversion %}
+  <icmp-block-inversion />
 {%- endif %}
 {%- if 'masquerade' in zone %}
   {%- if zone.masquerade %}