Fix starting of emulator on tns debug <platform> when device is not attached

`tns debug <platform>` command should start emulator in case device is not attached. The current command does not start emulator as we have passed `skipInferPlatform` - when this option is used, devicesService does not know for which platform to start the emulator.
Fix this by passing correct options.

Author: rosen-vladimirov

lib/commands/debug.ts

@@ -29,9 +29,6 @@
 
 		this.$config.debugLivesync = true;
 
-		await this.$devicesService.initialize({
-
-		});
 		await this.$devicesService.detectCurrentlyAttachedDevices();
 
 		const devices = this.$devicesService.getDeviceInstances();
@@ -86,8 +83,7 @@
 			platform: this.platform,
 			deviceId: this.$options.device,
 			emulator: this.$options.emulator,
-			skipDeviceDetectionInterval: true,
-			skipInferPlatform: true
+			skipDeviceDetectionInterval: true
 		});
 		// Start emulator if --emulator is selected or no devices found.
 		if (this.$options.emulator || this.$devicesService.deviceCount === 0) {

lib/common

@@ -338,7 +338,7 @@ export class IOSProjectService extends projectServiceBaseLib.PlatformProjectServ
 		if (!buildConfig.release && !buildConfig.architectures) {
 			await this.$devicesService.initialize({
 				platform: this.$devicePlatformsConstants.iOS.toLowerCase(), deviceId: buildConfig.device,
-				isBuildForDevice: true
+				skipEmulatorStart: true
 			});
 			let instances = this.$devicesService.getDeviceInstances();
 			let devicesArchitectures = _(instances)