AP_Param: add _FLAG to AP_PARAM_NO_SHIFT

Just for consistency with the other flags

libraries/AP_Arming/AP_Arming.cpp

@@ -80,7 +80,7 @@ const AP_Param::GroupInfo AP_Arming::var_info[] = {
     // @Values: 0:Disabled,1:THR_MIN PWM when disarmed,2:0 PWM when disarmed
     // @User: Advanced
     AP_GROUPINFO_FLAGS_FRAME("REQUIRE",     0,      AP_Arming,  require,                 1,
-                             AP_PARAM_NO_SHIFT,
+                             AP_PARAM_FLAG_NO_SHIFT,
                              AP_PARAM_FRAME_PLANE | AP_PARAM_FRAME_ROVER),
 
     // 2 was the CHECK paramter stored in a AP_Int16

libraries/AP_Param/AP_Param.cpp

@@ -158,7 +158,7 @@ void AP_Param::erase_all(void)
 */
 uint32_t AP_Param::group_id(const struct GroupInfo *grpinfo, uint32_t base, uint8_t i, uint8_t shift)
 {
-    if (grpinfo[i].idx == 0 && shift != 0 && !(grpinfo[i].flags & AP_PARAM_NO_SHIFT)) {
+    if (grpinfo[i].idx == 0 && shift != 0 && !(grpinfo[i].flags & AP_PARAM_FLAG_NO_SHIFT)) {
         /*
           this is a special case for a bug in the original design. An
           idx of 0 shifted by n bits is still zero, which makes it

libraries/AP_Param/AP_Param.h

@@ -62,7 +62,7 @@
 
 // don't shift index 0 to index 63. Use this when you know there will be
 // no conflict with the parent
-#define AP_PARAM_NO_SHIFT           (1<<3)
+#define AP_PARAM_FLAG_NO_SHIFT      (1<<3)
 
 // the var_info is a pointer, allowing for dynamic definition of the var_info tree
 #define AP_PARAM_FLAG_INFO_POINTER  (1<<4)