fix(tgtd.tmpl): fix salt-lint errors

```bash
Examining iscsi/target/config/files/default/tgtd.tmpl of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
iscsi/target/config/files/default/tgtd.tmpl:17
{{shift}}{{ '<' ~  key ~ '>' }}

[206] Jinja variables should have spaces before and after: {{ var_name }}
iscsi/target/config/files/default/tgtd.tmpl:19
{{shift}}{{ '</' ~ key.split(" ")[0] ~ '>' }}

[206] Jinja variables should have spaces before and after: {{ var_name }}
iscsi/target/config/files/default/tgtd.tmpl:22
{{shift}}{{ key }} {{ value }}
```

iscsi/target/config/files/default/tgtd.tmpl

@@ -14,12 +14,12 @@
 {%- macro tgtd(key, value, spaces=0, last=False) -%}
     {%- set shift = spaces * ' ' -%}
     {%- if value is mapping %}
-{{shift}}{{ '<' ~  key ~ '>' }}
+{{ shift }}{{ '<' ~  key ~ '>' }}
 {{ readconf(value, spaces|int+4) }}
-{{shift}}{{ '</' ~ key.split(" ")[0] ~ '>' }}
+{{ shift }}{{ '</' ~ key.split(" ")[0] ~ '>' }}
 
     {% elif value is string or value is number %}
-{{shift}}{{ key }} {{ value }}
+{{ shift }}{{ key }} {{ value }}
     {%- endif %}
 {%- endmacro -%}