Remove spaces in for statement heads (#19188)

Co-authored-by: fisker Cheung <lionkay@gmail.com>

tests/format/flow/flow-repo/binding/__snapshots__/format.test.js.snap

@@ -677,12 +677,12 @@ function try_scope() {
 
 function for_scope_let() {
   let a: number = 0;
-  for (let a = "" /* ok: local to init */; ; ) {}
+  for (let a = "" /* ok: local to init */; ;) {}
 }
 
 function for_scope_var() {
   var a: number = 0;
-  for (var a = "" /* error: string ~> number */; ; ) {}
+  for (var a = "" /* error: string ~> number */; ;) {}
 }
 
 function for_in_scope_let(o: Object) {

tests/format/flow/flow-repo/init/__snapshots__/format.test.js.snap

@@ -577,7 +577,7 @@ function do_while_post_init(b) {
 
 // local use of annotated var in for is ok
 function for_scoped_init(b) {
-  for (; b; ) {
+  for (; b;) {
     var x: number = 0;
     var y: number = x;
   }
@@ -586,14 +586,14 @@ function for_scoped_init(b) {
 // ...but use before for gives undefined
 function for_pre_init(b) {
   var y: number = x; // error
-  for (; b; ) {
+  for (; b;) {
     var x: number = 0;
   }
 }
 
 // ...and after
 function for_post_init(b) {
-  for (; b; ) {
+  for (; b;) {
     var x: number = 0;
   }
   var y: number = x; // error

tests/format/flow/flow-repo/locals/__snapshots__/format.test.js.snap

@@ -98,7 +98,7 @@ function try_scope_finally() {
 function for_scope() {
   let a = "";
   let b = "";
-  for (let a; ; ) {
+  for (let a; ;) {
     a = 0; // doesn't add lower bound to outer a
     b = 0;
   }

tests/format/flow/flow-repo/refinements/__snapshots__/format.test.js.snap

@@ -744,7 +744,7 @@ function def_assign_within_try(b: boolean, obj: Obj) {
 }
 
 function def_assign_within_for(b: boolean, obj: Obj) {
-  for (; b; ) {
+  for (; b;) {
     obj.p = 10; // (obj.p : number)
     var x: number = obj.p; // ok by def assign
   }