Fix printing tables with borders and indentation

When printing tables with borders and indentation the resulting markup
was incorrect. Instead of adding the indentation to the format of the
first cell, with indent the whole line.

Before:
```
  +------  +--------  +-------+
|   Name | Number | Color |
|   Erik |      1 | green |
  +------  +--------  +-------+
```

After
```
  +------+--------+-------+
  | Name | Number | Color |
  | Erik |      1 | green |
  +------+--------+-------+
```

lib/thor/shell/table_printer.rb

@@ -36,7 +36,7 @@ def print(array)
 
           sentence = truncate(sentence)
           sentence << "|" if options[:borders]
-          stdout.puts sentence
+          stdout.puts indentation + sentence
 
         end
         print_border_separator if options[:borders]
@@ -66,7 +66,6 @@ def prepare(array)
           end
         end
 
-        @formats[0] = @formats[0].insert(0, " " * @indent)
         @formats << "%s"
       end
 
@@ -95,10 +94,10 @@ def format_cell(column, row_size, index)
       end
 
       def print_border_separator
-        top = @maximas.map do |maxima|
-          " " * @indent + "+" + "-" * (maxima + 2 * @padding)
+        separator = @maximas.map do |maxima|
+          "+" + "-" * (maxima + 2 * @padding)
         end
-        stdout.puts top.join + "+"
+        stdout.puts indentation + separator.join + "+"
       end
 
       def truncate(string)
@@ -108,11 +107,15 @@ def truncate(string)
           if chars.length <= @truncate
             chars.join
           else
-            chars[0, @truncate - 3].join + "..."
+            chars[0, @truncate - 3 - @indent].join + "..."
           end
         end
       end
 
+      def indentation
+        " " * @indent
+      end
+
       if "".respond_to?(:encode)
         def as_unicode
           yield
@@ -129,4 +132,3 @@ def as_unicode
     end
   end
 end
-

spec/shell/basic_spec.rb

@@ -468,6 +468,20 @@ def  #456  Lanç...
 | Name | Number | Color |
 | Erik |      1 | green |
 +------+--------+-------+
+TABLE
+    end
+
+    it "prints a table with borders and indentation" do
+      table = [
+        ["Name", "Number", "Color"], # rubocop: disable Style/WordArray
+        ["Erik", 1, "green"]
+      ]
+      content = capture(:stdout) { shell.print_table(table, borders: true, indent: 2) }
+      expect(content).to eq(<<-TABLE)
+  +------+--------+-------+
+  | Name | Number | Color |
+  | Erik |      1 | green |
+  +------+--------+-------+
 TABLE
     end
   end