Probing cycle and view build info bug fixes.

- Probing cycle would drop into a QUEUED state, if multiple G38.2 are
sent. It would not honor the auto cycle start flags. To fix, the auto
cycle start state is saved at the beginning of the probing cycle and
restored at the end, since the feed hold it uses to stop a triggered
probe will disable the auto start flag. For now it’s a patch, rather
than a permanent fix.

- protocol_buffer_synchronize() also has a failure case. Auto cycle
start does not get executed when the system is waiting in here, so if
it’s in a QUEUED state already, it won’t resume. Patched here, but not
fully resolved.

- Fixed a problem with the “view build info” command. The EEPROM write
would do weird things and corrupt the EEPROM. Not sure exactly what
caused it, but it’s likely a compiler problem with an improperly
defined EEPROM address. It didn’t have enough room to store a full
string. To fix, the build info EEPROM range was increased and the max
number of STARTUP_BLOCKS was reduced to 2 from 3.

- Lastly, when a $I view build info is used for the first time, it
would normally show an EEPROM read error, since it wasn’t cleared or
wasn’t therein the first place. It will now not show that error. A
patch rather than a permanent fix again.

config.h

@@ -86,10 +86,10 @@
 // #define HOMING_FORCE_SET_ORIGIN // Uncomment to enable.
 
 // Number of blocks Grbl executes upon startup. These blocks are stored in EEPROM, where the size
-// and addresses are defined in settings.h. With the current settings, up to 3 startup blocks may
+// and addresses are defined in settings.h. With the current settings, up to 2 startup blocks may
 // be stored and executed in order. These startup blocks would typically be used to set the g-code
 // parser state depending on user preferences.
-#define N_STARTUP_LINE 2 // Integer (1-3)
+#define N_STARTUP_LINE 2 // Integer (1-2)
 
 // Number of floating decimal points printed by Grbl for certain value types. These settings are 
 // determined by realistic and commonly observed values in CNC machines. For example, position