app/internal/window: [macOS] ignore result from CVDisplayLinkStart

Larry Clapp reported a panic from failing to start the display link.
Ignore the error and hope the error is transient.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/window/os_darwin.go

@@ -133,9 +133,7 @@ func (d *displayLink) run(dl C.CFTypeRef) {
 				atomic.StoreUint32(&d.running, 1)
 				if !started {
 					started = true
-					if res := C.gio_startDisplayLink(dl); res != 0 {
-						panic("failed to start display link")
-					}
+					C.gio_startDisplayLink(dl)
 				}
 			}
 		case did := <-d.dids: