LLDB command completion doesn't handle whitespaces in the typename

LLDB command completion doesn't handle whitespaces in the typename. For example:
```
(lldb) type synthetic add 'Goo' -l test
(lldb) type synthetic list
-----------------------
Category: default
-----------------------
Goo: Python class test
-----------------------
Category: VectorTypes
-----------------------
-----------------------
Category: system
-----------------------
```

When we type `type synthetic delete` and call completion, status quo is:
```
(lldb) type synthetic delete Goo
```

But we want the typename to be in quotes instead:
```
(lldb) type synthetic delete 'Goo'
```