fix: correct receiveFrom call signature in Parent constructor

[blahah]

Summary

Fix ui.app.parent throwing TypeError: The "listener" argument must be of type function when accessed from within a ui.View.

Problem

The Parent class constructor was passing two arguments to receiveFrom():

ipc.receiveFrom(id, (...args) => {
  this.emit('message', ...args)
})

But receiveFrom() only accepts one argument (the listener function), so id was being treated as the listener, causing:

TypeError: The "listener" argument must be of type function. Received undefined
    at checkListener (events:140:11)
    at Readable.once (events:634:3)
    at get parent (pear-electron/lib/index.js:163:24)

Solution

Remove the erroneous id argument to align with how GuiCtrl#rxtx() correctly calls receiveFrom():

ipc.receiveFrom((...args) => {
  this.emit('message', ...args)
})

Test plan

• Verified ui.app.parent no longer throws when accessed from a ui.View
• Parent-child messaging works correctly after the fix

Fixes #98

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