Remove unused/invalid Flow suppression

Summary:
The suppression comment was not formatted correctly and thus not
used.
Closes https://github.com/facebook/react-native/pull/10076

Differential Revision: D3917036

fbshipit-source-id: 92927993fb7223dc131d82096ca92017aea5f1aa

Libraries/Animated/src/Interpolation.js

@@ -163,7 +163,7 @@ function colorToRgba(input: string): string {
     return input;
   }
 
-  int32Color = int32Color || 0; // $FlowIssue
+  int32Color = int32Color || 0;
 
   var r = (int32Color & 0xff000000) >>> 24;
   var g = (int32Color & 0x00ff0000) >>> 16;