Merge pull request #9506 from Josar/pr/ternary

Uncrustify: ternary operator indentation

uncrustify-riot.cfg

-indent_with_tabs   = 0                 # 1=indent to level only, 2=indent with tabs
-input_tab_size     = 4                 # original tab size
-output_tab_size    = 4                 # new tab size
-indent_columns     = output_tab_size   #
-indent_label       = 1                 # pos: absolute col, neg: relative column
-indent_switch_case = 4                 # number
+indent_with_tabs        = 0                 # 1=indent to level only, 2=indent with tabs
+input_tab_size          = 4                 # original tab size
+output_tab_size         = 4                 # new tab size
+indent_columns          = output_tab_size   #
+indent_label            = 1                 # pos: absolute col, neg: relative column
+indent_switch_case      = 4                 # number
+indent_ternary_operator = 2                 # When the `:` is a continuation, indent it under `?`
 
 #
 # inter-symbol newlines