Update aivo_get_subjects.m

Few fixes, For mistake I have already updated the aivo_get_subjects in shared/magia/aivo.
But the bug fix was clear, no doubt about the improvement, so I left it changed.

aivo/aivo_get_subjects.m

@@ -53,7 +53,7 @@ if((~mod(nargin,2)))
         value = varargin{i+l+1};
         l=l+1;
         % Materia view - Values
-        if(ismember(field,{'study_date','mri_code','dose','scan_start_time','injection_time','height','weight','age'}))
+        if(ismember(field,{'study_date','dose','scan_start_time','injection_time','height','weight','age'}))
             if(ischar(value)) %only one value
                 if(ismember('~',value))  %exclude spesific value
                     where_statement = [where_statement,' NOT ','materia.',lower(field),' = ',char(39),value(2:length(value)),char(39)];