Fix crash when redoing a manual block placement

On undo/redo, add_block was passing a wrong argument that was causing the program to crash.

Fixes #115

Author: Bentroen

scripts/action_redo/action_redo.gml

@@ -21,7 +21,7 @@ arg14 = history[historypos, 15]
 changed = 1
 
 if (t = h_addblock) {
-    add_block(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
+    add_block(arg0, arg1, arg2, arg3, arg4, arg5, arg6)
 } else if (t = h_removeblock) {
     remove_block(arg0, arg1)
 } else if (t = h_changeblock) {

scripts/action_undo/action_undo.gml

@@ -22,7 +22,7 @@ changed = 1
 if (t = h_addblock) {
     remove_block(arg0, arg1)
 } else if (t = h_removeblock) {
-    add_block(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
+    add_block(arg0, arg1, arg2, arg3, arg4, arg5, arg6)
 } else if (t = h_changeblock) {
     change_block(arg0, arg1, arg7, arg8, arg9, arg10, arg11)
 } else if (t = h_selectadd) {