Fix ftplugin/indent checks being swaped.

Author: kristijanhusak

ftplugin/org.vim

@@ -1,7 +1,7 @@
-if exists('b:did_indent')
+if exists('b:did_ftplugin')
   finish
 endif
-let b:did_indent = 1
+let b:did_ftplugin = 1
 
 lua require('orgmode.config'):setup_mappings('org')
 function OrgmodeOmni(findstart, base)

indent/org.vim

@@ -1,7 +1,7 @@
-if exists('b:did_ftplugin')
+if exists('b:did_indent')
   finish
 endif
-let b:did_ftplugin = 1
+let b:did_indent = 1
 
 function! OrgmodeFoldExpr()
   return luaeval('require("orgmode.org.indent").foldexpr()')