style: remove spaces between method names and opening parentheses in Set class

Remove the extraneous whitespace separating method names from their parameter lists
across all method definitions in the Set class (add, remove, contains, iterate,
iteratorValue, map, where) to conform to standard Wren formatting conventions.

example/set.wren

@@ -24,12 +24,12 @@ class Set {
     }
   }
 
-  add (element) {
+  add(element) {
     _clean = false
     _list.add(element)
   }
   
-  remove (element) {
+  remove(element) {
     cleanup // Remove duplicates, so we can return early upon deletion.
     for (i in 0.._list.count) {
       if (_list[i] == element) {
@@ -39,7 +39,7 @@ class Set {
     }
   }
   
-  contains (element) {
+  contains(element) {
     return _list.contains(element)
   }
 
@@ -48,7 +48,7 @@ class Set {
     return _list.count
   }
   
-  iterate (i) {
+  iterate(i) {
     cleanup
     if (i == null) {
       if (count > 0) return 0
@@ -58,16 +58,16 @@ class Set {
     return i + 1
   }
   
-  iteratorValue (i) {
+  iteratorValue(i) {
     cleanup
     return _list[i]
   }
 
-  map (f) {
+  map(f) {
     return new Set(_list.map(f))
   }
   
-  where (f) {
+  where(f) {
     return new Set(_list.where(f))
   }