Prevent flow-strip-types/flow-comments from removing entire ClassProperty

[danharper]

Q	A
Bug fix?	yes
Breaking change?	no
New feature?	no
Deprecations?	no
Spec compliancy?	no
Tests added/pass?	yes
Fixed tickets	#4388
License	MIT
Doc PR	-

ClassProperty had the Flow alias, which was causing it to be stripped, or converted to a comment.

It's the only non-Flow-specific syntax with that alias, and removing the alias doesn't break any other tests.

---

Input:

class X {
  foo = 2
  bar: number = 3
  baz: ?string
}

Previous flow-strip-types:

class X {}

New flow-strip-types:

class X {
  foo = 2;
  bar = 3;
}

Previous flow-comments:

class X {
  /*:: foo = 2*/
  /*:: bar: number = 3*/
  /*:: baz: ?string*/
}

New flow-comments:

class X {
  foo = 2;
  bar /*: number*/ = 3;
  baz /*: ?string*/;
}

[codecov-io]

Current coverage is 88.91% (diff: 100%)

Merging #4587 into master will increase coverage by 0.19%

@@             master      #4587   diff @@
==========================================
  Files           195        195          
  Lines         13754      13875   +121   
  Methods        1424       1444    +20   
  Messages          0          0          
  Branches       3167       3207    +40   
==========================================
+ Hits          12203      12337   +134   
+ Misses         1551       1538    -13   
  Partials          0          0          

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[danez]

Nice catch.