turn on check temp and release all axes buttons by default

custombtn.txt

@@ -3,7 +3,8 @@ btns=[
 ###Below these instructions, add a line with the following format for each button
 # ["button name","command",color(RGB)], <--That comma is important, do not forget it
 ###As an example: (Remove the # to try it out):
-#["Read temp","M105",(200,100,100)],
+["Read temp","M105",(200,100,100)],
+["Release All Axes","M84",(300,100,100)],
 ###You can use gcodes or any pronsole/pronterface commands
 ###The first three buttons will end up at the top of the window, visible in mini mode
 ###The rest of the buttons will be at the bottom of the gcode preview