useDefineForClassFields skips emit of ambient properties

Previously:

```ts
class C {
  declare p
}
```

would incorrectly emit

```js
class C {
    constructor() {
        Object.defineProperty(this, "p", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: void 0
        });
    }
}
```

when useDefineForClassFields was turned on (for targets <ESNext).

src/compiler/transformers/utilities.ts

@@ -314,7 +314,7 @@ namespace ts {
      */
     function isInitializedOrStaticProperty(member: ClassElement, requireInitializer: boolean, isStatic: boolean) {
         return isPropertyDeclaration(member)
-            && (!!member.initializer || !requireInitializer)
+            && (!!member.initializer || !requireInitializer && !(getOriginalNode(member).flags & NodeFlags.Ambient))
             && hasStaticModifier(member) === isStatic;
     }
 

tests/baselines/reference/definePropertyES5.js

@@ -6,6 +6,7 @@ class A {
     ["computed"] = 13
     ;[x] = 14
     m() { }
+    declare notEmitted: boolean;
 }
 
 

tests/baselines/reference/definePropertyES5.symbols

@@ -21,5 +21,8 @@ class A {
 
     m() { }
 >m : Symbol(A.m, Decl(definePropertyES5.ts, 5, 13))
+
+    declare notEmitted: boolean;
+>notEmitted : Symbol(A.notEmitted, Decl(definePropertyES5.ts, 6, 11))
 }
 

tests/baselines/reference/definePropertyES5.types

@@ -25,5 +25,8 @@ class A {
 
     m() { }
 >m : () => void
+
+    declare notEmitted: boolean;
+>notEmitted : boolean
 }
 

tests/cases/conformance/classes/propertyMemberDeclarations/definePropertyES5.ts

@@ -7,4 +7,5 @@ class A {
     ["computed"] = 13
     ;[x] = 14
     m() { }
+    declare notEmitted: boolean;
 }