Encode revision for extension point to fix breaking change (#1585)

Encode revision on extension points to fix a breaking change which slipped through with release 2.14.0.

scm-ui/ui-webapp/src/repos/sources/containers/Content.tsx

@@ -141,7 +141,7 @@ class Content extends React.Component<Props, State> {
             props={{
               repository,
               file,
-              revision,
+              revision: revision ? encodeURIComponent(revision) : "",
               handleExtensionError: this.handleExtensionError
             }}
             renderAll={true}