Fix handling of java-backend

- Without this line the lsp-java package won't be enabled when java-backend is
nil and lsp layer is present

CHANGELOG.develop

@@ -1945,6 +1945,9 @@ Other:
   - ~SPC m r g t~ to generate =toString= method
   - ~SPC m r g o~ to generate method overrides
   - ~SPC m c p~ create spring boot project
+- Fixes:
+  - Enabled =lsp-java= when the =java-backend= is =nil= and the =lsp= layer is
+    enabled (thanks to Ivan Yonchovski)
 **** Javascript
 - Improvements:
   - Leverage js-doc Yasnippet integration if available (thanks to Andriy Kmit')

layers/+lang/java/packages.el

@@ -162,7 +162,7 @@
 (defun java/init-lsp-java ()
   (use-package lsp-java
     :defer t
-    :if (eq java-backend 'lsp)
+    :if (eq (spacemacs//java-backend) 'lsp)
     :config
     (progn
       ;; key bindings