fix(ui)!: Change number_huge and unit_huge to match the man page short codes

BREAKING CHANGE: The style codes for huge file and units where
  documented to be `nt` and `ut` but the code was using `nh` and `uh`.
  The code has been updated to match the documented style codes.
  EXA_COLORS using style codes `nh` and `uh` will need to be updated to
  use `nt` and `ut`.

src/theme/mod.rs

@@ -522,13 +522,13 @@ mod customs_test {
     test!(exa_nk:  ls "", exa "nk=38;5;116"  =>  colours c -> { c.size.number_kilo          = Fixed(116).normal(); });
     test!(exa_nm:  ls "", exa "nm=38;5;117"  =>  colours c -> { c.size.number_mega          = Fixed(117).normal(); });
     test!(exa_ng:  ls "", exa "ng=38;5;118"  =>  colours c -> { c.size.number_giga          = Fixed(118).normal(); });
-    test!(exa_nh:  ls "", exa "nh=38;5;119"  =>  colours c -> { c.size.number_huge          = Fixed(119).normal(); });
+    test!(exa_nt:  ls "", exa "nt=38;5;119"  =>  colours c -> { c.size.number_huge          = Fixed(119).normal(); });
 
     test!(exa_ub:  ls "", exa "ub=38;5;115"  =>  colours c -> { c.size.unit_byte            = Fixed(115).normal(); });
     test!(exa_uk:  ls "", exa "uk=38;5;116"  =>  colours c -> { c.size.unit_kilo            = Fixed(116).normal(); });
     test!(exa_um:  ls "", exa "um=38;5;117"  =>  colours c -> { c.size.unit_mega            = Fixed(117).normal(); });
     test!(exa_ug:  ls "", exa "ug=38;5;118"  =>  colours c -> { c.size.unit_giga            = Fixed(118).normal(); });
-    test!(exa_uh:  ls "", exa "uh=38;5;119"  =>  colours c -> { c.size.unit_huge            = Fixed(119).normal(); });
+    test!(exa_ut:  ls "", exa "ut=38;5;119"  =>  colours c -> { c.size.unit_huge            = Fixed(119).normal(); });
 
     test!(exa_df:  ls "", exa "df=38;5;115"  =>  colours c -> { c.size.major                = Fixed(115).normal(); });
     test!(exa_ds:  ls "", exa "ds=38;5;116"  =>  colours c -> { c.size.minor                = Fixed(116).normal(); });

src/theme/ui_styles.rs

@@ -194,12 +194,12 @@ impl UiStyles {
             "nk" => self.size.number_kilo         = pair.to_style(),
             "nm" => self.size.number_mega         = pair.to_style(),
             "ng" => self.size.number_giga         = pair.to_style(),
-            "nh" => self.size.number_huge         = pair.to_style(),
+            "nt" => self.size.number_huge         = pair.to_style(),
             "ub" => self.size.unit_byte           = pair.to_style(),
             "uk" => self.size.unit_kilo           = pair.to_style(),
             "um" => self.size.unit_mega           = pair.to_style(),
             "ug" => self.size.unit_giga           = pair.to_style(),
-            "uh" => self.size.unit_huge           = pair.to_style(),
+            "ut" => self.size.unit_huge           = pair.to_style(),
             "df" => self.size.major               = pair.to_style(),
             "ds" => self.size.minor               = pair.to_style(),