Fix index for x/Y plane separation in by plane control

* Matrix lines are numbered from 0 to 99
* X from 0 to 49 included, Y from 50 to 99 included

hdl/corr_ll.vhd

@@ -101,7 +101,7 @@ begin
     begin
 
         -- Signal mux for X/Y coef and enable/reset, based on PSCID number
-        gen_x_sigmux:if I < 51 generate
+        gen_x_sigmux:if I < 50 generate
             coef_a         <= coef_a_x;
             coef_b         <= coef_b_x;
             coef_ic        <= coef_ic_x;
@@ -110,7 +110,7 @@ begin
             reset_corr     <= reset_corr_x;
         end generate;
 
-        gen_y_sigmux:if I > 50 generate
+        gen_y_sigmux:if I > 49 generate
             coef_a         <= coef_a_y;
             coef_b         <= coef_b_y;
             coef_ic        <= coef_ic_y;