Testsuite: drop unused file

Should have been removed in b70d99d1.

tests/initval_file/ramst_initval_file_data.m

-x = vertcat([ 1; 1.2 ], repmat(1, 200, 1));
-k = repmat(13, 202, 1);
-c = repmat(1.5, 202, 1);
-save('ramst_initval_file_data_col_vec_mat.mat','c','k','x');
-
-if ispc()
-    xlswrite('ramst_initval_file_excel',[x k c],1,'A2');
-    xlswrite('ramst_initval_file_excel',{'x' 'k' 'c'},1,'A1');
-end
-
-c=c';
-k=k';
-x=x';
-save('ramst_initval_file_data_row_vec_mat.mat','c','k','x');