nvim: after/plugin/word-column: Fix conflicting mapping with target

Since we now have more mapping available after dropping treesitter
text objects, we can fix this.

Fixes the below warning from targets check health.

targets: health#targets#check
========================================================================
  - WARNING: Conflicting mapping found:
    aq → <Plug>(textobj-wordcolumn-word-a)
    q → {'quote': [{'d': ''''}, {'d': '"'}, {'d': '`'}]}
  - WARNING: Conflicting mapping found:
    iq → <Plug>(textobj-wordcolumn-word-i)
    q → {'quote': [{'d': ''''}, {'d': '"'}, {'d': '`'}]}

nvim/.config/nvim/after/plugin/word-column.vim

@@ -1,10 +1,10 @@
 call textobj#user#map('wordcolumn', {
   \ 'word' : {
-  \   'select-i' : 'iq',
-  \   'select-a' : 'aq',
+  \   'select-i' : 'is',
+  \   'select-a' : 'as',
   \   },
   \ 'WORD' : {
-  \   'select-i' : 'iQ',
-  \   'select-a' : 'aQ',
+  \   'select-i' : 'iS',
+  \   'select-a' : 'aS',
   \   },
   \ })