Update telemetry.ts

it looks like in [package.json line 5](https://github.com/microsoft/vscode-cpptools/blob/a62acdb5a52438540c266b409a0ee7f8e64f7a9b/Extension/package.json#L5), we add a suffix, "main", to the version. When we assign customers to target populations for experiments, we were trying to assign customers without any suffix to Public, which resulted in no one being included. Instead, I think we should be checking if the suffix is "main" and assign those customers to Public.

Author: jureid

Extension/src/telemetry.ts

@@ -65,7 +65,7 @@ export function activate(): void {
             if (packageInfo) {
                 let targetPopulation: TargetPopulation;
                 const userVersion: PackageVersion = new PackageVersion(packageInfo.version);
-                if (userVersion.suffix === "") {
+                if (userVersion.suffix === "main") {
                     targetPopulation = TargetPopulation.Public;
                 } else if (userVersion.suffix === "insiders") {
                     targetPopulation = TargetPopulation.Insiders;