Update zone defaults (#281)

Author: Panzerhandschuh

fgd/brush/trigger/zone_timer_stage.fgd

@@ -7,6 +7,6 @@
 	checkpoints_required(boolean) : "Checkpoints Required" : 1 : "Is the player required to activate all checkpoints before progressing to the next stage? Otherwise, checkpoint zones may be skipped for this stage."
 	checkpoints_ordered(boolean) : "Checkpoints Ordered" : 1 : "Do the checkpoints in this segment have a logical order, even if the player is not required to activate them all?"
 	limit_ground_speed(boolean) : "Limit ground speed" : 1 : "Limit ground speed to walking speed (prevents bunny hopping)."
-	safe_height(float) : "Safe Height" : -1 : "Height that the player must be under to start a run of this stage track. Safe height is not a factor in activating the stage when running the full main track. -1 = full zone, 0 = base of zone, > 0 = custom height."
+	safe_height(float) : "Safe Height" : 0 : "Height that the player must be under to start a run of this stage track. Safe height is not a factor in activating the stage when running the full main track. -1 = full zone, 0 = base of zone, > 0 = custom height."
 	restart_destination(target_destination) : "Restart Destination (Required)" : : "The entity specifying the point to which the player should be teleported when restarting a stage. The player will be placed directly on the ground below this point if possible."
 	]

fgd/brush/trigger/zone_timer_start.fgd

@@ -10,7 +10,7 @@
 		0 : "Last Checkpoint"
 		1 : "Next Stage"
 		]
-	checkpoints_required(boolean) : "Checkpoints Required" : 0 : "Is the player required to activate all checkpoints before progressing? Otherwise, checkpoint zones may be skipped. If there are multiple stages, this only applies to Stage 1."
+	checkpoints_required(boolean) : "Checkpoints Required" : 1 : "Is the player required to activate all checkpoints before progressing? Otherwise, checkpoint zones may be skipped. If there are multiple stages, this only applies to Stage 1."
 	checkpoints_ordered(boolean) : "Checkpoints Ordered" : 1 : "Do the checkpoints in this segment have a logical order, even if the player is not required to activate them all? If there are multiple stages, this only applies to Stage 1."
 	safe_height(float) : "Safe Height" : 0 : "Height that the player must be under to start a run of this stage track. Safe height is not a factor in activating the stage when running the full main track. -1 = full zone, 0 = base of zone, > 0 = custom height."
 	max_velocity(float) : "Max Velocity" : -1 : "Maximum speed that the player can move at. -1 = gamemode default, 0 = unlimited, > 0 = custom limit."