tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

tests/data/test1213

@@ -26,13 +26,13 @@ the content goes here
 <server>
 http
 </server>
- <name>
+<name>
 HTTP with proxy and host-only URL
- </name>
+</name>
 # the thing here is that this sloppy form is accepted and we convert it
 # for normal server use, and we need to make sure it gets converted to
 # RFC style even for proxies
- <command>
+<command>
 -x %HOSTIP:%HTTPPORT we.want.that.site.com.%TESTNUMBER
 </command>
 <features>