Run fish_indent on all our fish scripts

It's now good enough to do so.

We don't allow grid-alignment:

```fish
complete -c foo -s b -l barnanana -a '(something)'
complete -c foo -s z              -a '(something)'
```

becomes

```fish
complete -c foo -s b -l barnanana -a '(something)'
complete -c foo -s z -a '(something)'
```

It's just more trouble than it is worth.

The one part I'd change:

We align and/or'd parts of an if-condition with the in-block code:

```fish
if true
   and false
    dosomething
end
```

becomes

```fish
if true
    and false
    dosomething
end
```

but it's not used terribly much and if we ever fix it we can just
reindent.

tests/checks/read.fish

@@ -13,10 +13,12 @@ set -l
 # CHECK: b
 # CHECK: c
 
-echo "a  b b" | read a b; string escape $a $b
+echo "a  b b" | read a b
+string escape $a $b
 # CHECK: a
 # CHECK: 'b b'
 
-echo 'a<><>b<>b' | read -d '<>' a b; printf %s\n $a $b
+echo 'a<><>b<>b' | read -d '<>' a b
+printf %s\n $a $b
 # CHECK: a
 # CHECK: <>b<>b