Change default indent to 2 Spaces in .editorconfig

The "de facto" coding style seems to be 2 spaces indent in *.pp files.
Make this the default for supported editors

Author: jradmacher

.editorconfig

@@ -5,9 +5,9 @@ root = true
 [*]
 charset = utf-8
 end_of_line = lf
-indent_size = 4
-tab_width = 4
-indent_style = tab
+indent_size = 2
+tab_width = 2
+indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true