Format `.able` test files

Unified mixed 2-space and 4-space indentation into uniform 3-space
indentation.

able-script-test/functio.able

@@ -1,4 +1,4 @@
 functio hello(words){
-  words print;
+   words print;
 }
 hello("wonk");

able-script-test/iotest.able

@@ -1,5 +1,5 @@
 var data;
 loop {
-  data read;
-  data print;
+   data read;
+   data print;
 }

able-script-test/pass-by-reference.able

@@ -2,9 +2,9 @@ owo Pass-by-reference test
 
 owo Swap two variables.
 functio swap(left, right) {
-    var tmp = left;
-    left = right;
-    right = tmp;
+   var tmp = left;
+   left = right;
+   right = tmp;
 }
 
 var foo = "hello";
@@ -13,11 +13,11 @@ var bar = "world";
 swap(foo, bar);
 
 if (foo != "world") {
-    "FAILED" print;
-    "foo should be 'world', is actually:" print;
-    foo print;
+   "FAILED" print;
+   "foo should be 'world', is actually:" print;
+   foo print;
 }
 
 if (foo == "world") {
-    "OK" print;
+   "OK" print;
 }