fix: Change ID count register to a uint16

* Not sure, but maybe there was a sign issue there

hdl/top_corr_matrix.vhd

@@ -204,7 +204,7 @@ begin
         -- Coef table, desyrdl
         mm_coef_i              => mm_a2l.MATRIXCOEF,
         mm_coef_o              => mm_l2a.MATRIXCOEF,
-        id_cnt_load            => mm_a2l.MM_ID_CNT.data.data,
+        id_cnt_load            => mm_a2l.MM_ID_CNT.data.data(C_W_MM_IDCNT-1 downto 0),
 
         -- Position data in
         pos_x                  => errbpm_x,

rdl/corr_matrix.rdl

@@ -154,7 +154,8 @@ addrmap corr_matrix {
 
     reg {
         desc="Number of ID to count for matrix multiplication.";
-        field {sw = rw; hw = r;} data[`C_W_MM_IDCNT] = `C_N_MM_BPM;
+        desyrdl_data_type="uint16";
+        field {sw = rw; hw = r;} data[16] = `C_N_MM_BPM;
     } MM_ID_CNT;
 
     reg {