Fix Style/FormatString offenses

`Kernel#format` is faster and will avoid to allocate an array compared
to `String#%`.

```
IPS:
       kernel_format:  3877614.2 i/s
      string_percent:  3531475.0 i/s - 1.10x  (± 0.00) slower

Memory:
       kernel_format:        160 allocated
      string_percent:        200 allocated - 1.25x more
```

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/axlsx/workbook/worksheet/worksheet.rb b/lib/axlsx/workbook/worksheet/worksheet.rb
index 29a22db1..07221b3f 100644
--- a/lib/axlsx/workbook/worksheet/worksheet.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet.rb
@@ -675,9 +675,9 @@ module Axlsx
         if parts.size > 2
           raise ArgumentError, (ERR_CELL_REFERENCE_INVALID % cell_def)
         elsif parts.first.nil?
-          raise ArgumentError, (ERR_CELL_REFERENCE_MISSING_CELL % [cell_def.split(":").first, cell_def])
+          raise ArgumentError, format(ERR_CELL_REFERENCE_MISSING_CELL, cell_def.split(":").first, cell_def)
         elsif parts.last.nil?
-          raise ArgumentError, (ERR_CELL_REFERENCE_MISSING_CELL % [cell_def.split(":").last, cell_def])
+          raise ArgumentError, format(ERR_CELL_REFERENCE_MISSING_CELL, cell_def.split(":").last, cell_def)
         end
 
         range(*parts)