[csharp] Hide mode-line indicator: omnisharp

CHANGELOG.develop

@@ -1123,6 +1123,7 @@ Other:
   - No need to unset =omnisharp-auto-complete-want-documentation= anymore
    (thanks to Saulius Menkevičius)
   - Add ~SPC m t~ which key prefix: =csharp/tests= (thanks to duianto)
+  - Hide mode-line indicator: =omnisharp= (thanks to duianto)
 - Key bindings:
   - New key binding =SPC m g e= for =omnisharp-solution-errors=
     (thanks to Saulius Menkevičius)

layers/+lang/csharp/packages.el

@@ -94,7 +94,8 @@
         "u" 'omnisharp-auto-complete-overrides
         "i" 'omnisharp-fix-usings
         ;; [missing in roslyn] "=" 'omnisharp-code-format
-))))
+        )
+      (spacemacs|hide-lighter omnisharp-mode))))
 
 (defun csharp/post-init-company ()
   (when (configuration-layer/package-used-p 'omnisharp)