Installation bug, duplicate script call/reference

It seems the following line is called twice (see line 166): 
https://github.com/utPLSQL/utPLSQL/blob/75037c8ec46aa280058e047015c9a50a60ec6b0c/source/install.sql#L169

The duplicate generates the following error:
```
ERROR at line 1:
ORA-00955: name is already used by an existing object
ORA-06512: at line 9
```