Define color for grid info

Need allow in future user select it by command (add palette)

nanovna.h

@@ -530,6 +530,7 @@ extern volatile uint8_t redraw_request;
 #define DARK_GREY                   RGB565(140,140,140)
 #define LIGHT_GREY                  RGB565(220,220,220)
 #define DEFAULT_GRID_COLOR          RGB565(128,128,128)
+#define DEFAULT_GRID_VALUE_COLOR    RGB565(196,196,196)
 #define DEFAULT_MENU_COLOR          RGB565(255,255,255)
 #define DEFAULT_MENU_TEXT_COLOR     RGB565(  0,  0,  0)
 #define DEFAULT_MENU_ACTIVE_COLOR   RGB565(180,255,180)

plot.c

@@ -1953,7 +1953,7 @@ static void cell_grid_line_info(int x0, int y0)
   char buf[32];
   int xpos = GRID_X_TEXT - x0;
   int ypos = 0 - y0 + 2;
-  ili9341_set_foreground(/* DEFAULT_GRID_COLOR */ DEFAULT_MENU_COLOR );
+  ili9341_set_foreground(DEFAULT_GRID_VALUE_COLOR);
   float   ref = get_trace_refpos(TRACE_ACTUAL);
   float scale = get_trace_scale(TRACE_ACTUAL);;
   for (int i = 0; i < NGRIDY; i++){

ui_sa.c

@@ -1042,7 +1042,7 @@ static void menu_settings2_cb(int item, uint8_t data)
     toggle_AGC();
     break;
   case 2:
-    toggle_LNA();;
+    toggle_LNA();
     break;
   case 3:
     toggle_tracking();