reorder the {module_include location='customer_list_header'} in the template customers after firstname and lastname like the body of the table

add {module_include location='customer_list_header'} in the template search.html because there was only the line
{module_include location='customer_list_row'} in the body of the table
Merge pull request #395 from Yochima/yochima-branch

put the module_include "customer_list_header" in the correct place