Bind 'SPC i u' to 'insert unicode character'

With a counsel remapping. We need a helm one too.

modules/completion/ivy/config.el

@@ -201,6 +201,7 @@ evil-ex-specific constructs, so we disable it solely in evil-ex."
     [remap evil-ex-registers]        #'counsel-evil-registers
     [remap yank-pop]                 #'counsel-yank-pop
     [remap locate]                   #'counsel-locate
+    [remap unicode-chars-list-chars] #'counsel-unicode-char
     [remap compile]                    #'+ivy/compile
     [remap projectile-compile-project] #'+ivy/project-compile)
   :config