[Users] Remove default variable guess from Multipole

[Ian Hinder]

Hi,

When the Multipole thorn was first written at Penn State for  
debugging, we were using it with WeylScal4 and to avoid  
incompatibilities with early parameter files, when the "variables"  
parameter was added we decided that if it was left blank, it would  
default to the WeylScal4 Psi4 variable.  This is not a good logical  
default, as the thorn provides generic mode decomposition.  I would  
like to remove this, and the patch is attached.  OK to commit?

-- 
Ian Hinder
ian.hinder at aei.mpg.de
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