fix getting the current file provider

apps/remix-ide/src/app/files/compiler-metadata.js

@@ -92,13 +92,15 @@ class CompilerMetadata extends Plugin {
   // TODO: is only called by dropdownLogic and can be moved there
   deployMetadataOf (contractName, fileLocation) {
     return new Promise((resolve, reject) => {
-      var provider = this.fileManager.currentFileProvider()
+      var provider
       let path
       if (fileLocation) {
+        provider = this.fileManager.fileProviderOf(fileLocation)
         path = fileLocation.split('/')
         path.pop()
         path = path.join('/')
       } else {
+        provider = this.fileManager.currentFileProvider()
         path = this.fileManager.currentPath()
       }