Fix the issue that the first header is still right aligned

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: DT
 Type: Package
 Title: A Wrapper of the JavaScript Library 'DataTables'
-Version: 0.4.2
+Version: 0.4.3
 Authors@R: c(
     person("Yihui", "Xie", email = "[email protected]", role = c("aut", "cre")),
     person("Joe", "Cheng", role = "ctb"),

NEWS.md

@@ -4,7 +4,7 @@
 
 - `styleInterval()` and `styleEqual()` now generates the correct callback for `Date` and `Datetime` values. (thanks, @shrektan, #500, #495)
 
-- The `dt-right` class will no longer be added to numeric headers unexpectedly (thanks, @shrektan @carlganz @vnijs, #512 #511 #476).
+- The `dt-right` class will no longer be added to numeric headers unexpectedly (thanks, @shrektan @carlganz @vnijs, #514 #512 #511 #476).
 
 # CHANGES IN DT VERSION 0.4
 

R/datatables.R

@@ -295,7 +295,7 @@ classNameDefinedColumns = function(options, ncol) {
       if (is.numeric(col)) {
         col[col < 0] = col[col < 0] + ncol
       } else if ("_all" %in% col) {
-        col = seq_len(ncol)
+        col = seq_len(ncol) - 1
       } else {
         col = integer()
       }