Fix platformURL for BDC/CN

Closes #474

Tests done

From a clean install (no ~/.sevenbridges/rabix-composer directory)

1. Add local folder
2. Open local CWL
3. Add local cwl executor
4. Run test several times
5. Add BDC platform account
6. Push to platform
7. Open on platform
8. Run pushed app on local executor
9. Verify that sbg:draft2 automatically invokes
   bundled Rabix Executor

src/app/auth/model/auth-credentials.ts

@@ -27,7 +27,7 @@ export class AuthCredentials implements UserPlatformIdentifier {
         "https://api.sb.biodatacatalyst.nhlbi.nih.gov": {
             "name": "BioData Catalyst",
             "shortName": "BDCatalyst",
-            "platformURL": "https://platform.sb.biodatacatalyst.nhlbi.nih.gov/developer/#token",
+            "platformURL": "https://platform.sb.biodatacatalyst.nhlbi.nih.gov",
         },
         "https://cgc-api.sbgenomics.com": {
             "name": "Cancer Genomics Cloud",
@@ -42,7 +42,7 @@ export class AuthCredentials implements UserPlatformIdentifier {
         "https://api.sevenbridges.cn": {
             "name": "Seven Bridges (China)",
             "shortName": "SBG-CN",
-            "platformURL": "https://platform.sevenbridges.cn/developer#token",
+            "platformURL": "https://platform.sevenbridges.cn",
         },
     };