Small fix for handling display versions (#1625)

* Small fix for handling display versions

Making a distinction between __version__ and the version we display in the info panel (displayr_version).
The hosted cellxgene can overwrite the display_version using a plugin.

Improve version handling in the customized assets

client/src/components/menubar/infoMenu.js

@@ -41,11 +41,11 @@ const InformationMenu = React.memo((props) => {
             />
             <MenuItem
               target="_blank"
-              text={`cellxgene v${
+              text={
                 libraryVersions && libraryVersions.cellxgene
                   ? libraryVersions.cellxgene
                   : null
-              }`}
+              }
             />
             <MenuItem text="MIT License" />
             {tosURL ? (