index.js.flow: Export FormProps we pass *to* components

Documentation states that 'FormProps' is what's passed *to* a component
wrapped with reduxForm(); however, what was exported here was the props
that should be passed *by* a user *to* the <Form> component.

Switched to using the same naming convention as is already used for
other prop-types with the same potential for confusion: exported
'FieldProps' for the props Field passes to user components, and
non-exported FieldInputProps for the props Field expects to get from its
callers.

Fixes redux-form#3823.

src/index.js.flow

@@ -6,7 +6,7 @@ import type { Params as DefaultShouldValidateParams } from './defaultShouldValid
 import type { Params as DefaultShouldErrorParams } from './defaultShouldError'
 import type { Params as DefaultShouldWarnParams } from './defaultShouldWarn'
 import type { Config as ReduxFormConfig } from './createReduxForm'
-import type { Props as _FormProps } from './Form'
+import type { Props as FormInputProps } from './Form'
 import type { Props as _FormNameProps } from './FormName'
 import type {
   DefaultProps as FormSectionDefaultProps,
@@ -73,11 +73,10 @@ import type {
   Untouch
 } from './actions.types'
 
-export type { Event } from './types'
+export type { Event, FormProps } from './types'
 
 type StructureMap = Object
 
-export type FormProps = _FormProps
 export type FormNameProps = _FormNameProps
 export type { FieldProps } from './FieldProps.types'
 export type { FieldArrayProps } from './FieldArrayProps.types'
@@ -124,7 +123,7 @@ declare export var Fields: ComponentType<FieldsInputProps>
 
 declare export var FieldArray: ComponentType<FieldArrayInputProps>
 
-declare export var Form: ComponentType<FormProps>
+declare export var Form: ComponentType<FormInputProps>
 
 declare export var FormSection: ComponentType<FormSectionProps>