fix: platform clean not adding the platform back

fixes #5365

Author: rigor789

lib/controllers/platform-controller.ts

@@ -114,8 +114,13 @@ export class PlatformController implements IPlatformController {
 				projectData.projectDir,
 				platformData.platformNameLowerCase as SupportedPlatform
 			);
-			// if no version is explicitly added, then we use the latest
-			if (!version && !desiredRuntimePackage.version) {
+
+			if (version) {
+				desiredRuntimePackage.version = version;
+			}
+
+			if (!desiredRuntimePackage.version) {
+				// if no version is explicitly added, then we use the latest
 				desiredRuntimePackage.version = await this.$packageInstallationManager.getLatestCompatibleVersion(
 					desiredRuntimePackage.name
 				);

lib/services/platform/platform-validation-service.ts

@@ -54,7 +54,7 @@ export class PlatformValidationService implements IPlatformValidationService {
 		);
 		if (!hasPlatformDirectory) {
 			this.$errors.fail(
-				"The platform %s is not added to this project. Please use 'tns platform add <platform>'",
+				"The platform %s is not added to this project. Please use 'ns platform add <platform>'",
 				platform
 			);
 		}