appveyor simplify artifact handling

.appveyor.yml

@@ -32,7 +32,7 @@ before_deploy:
   - dir %APPVEYOR_BUILD_FOLDER%
 
 artifacts:
-  - path: './qgroundcontrol-installer.exe'
+  - path: qgroundcontrol-installer.exe
     name: s3
 
 deploy:
@@ -44,13 +44,13 @@ deploy:
     bucket: qgroundcontrol
     set_public: true
     folder: $(APPVEYOR_REPO_BRANCH)
-    artifact: './qgroundcontrol-installer.exe'
+    artifact: s3
     on:
       CONFIG: installer
   - provider: GitHub
     auth_token:
       secure: dzWLqd0eTKjrAWC5LgqVnwLemmrNdddGA2ZZn/OthAP37mwCLkP2C1zil7ivmEE8
-    artifact: './qgroundcontrol-installer.exe'
+    artifact: s3
     draft: false
     prerelease: false
     on: