Matugen: Fix ghostty theme template

This follows the example at https://ghostty.org/docs/features/theme

Author: XenHat

Assets/Templates/terminal/ghostty

@@ -1,22 +1,22 @@
-palette = 0= {{colors.surface_variant.default.hex}}
-palette = 1= {{colors.error.default.hex}}
-palette = 2= {{colors.primary.default.hex}}
-palette = 3= {{colors.secondary.default.hex}}
-palette = 4= {{colors.tertiary.default.hex}}
-palette = 5= {{colors.primary_fixed_dim.default.hex}}
-palette = 6= {{colors.secondary_fixed_dim.default.hex}}
-palette = 7= {{colors.on_surface.default.hex}}
-palette = 8= {{colors.on_surface_variant.default.hex}}
-palette = 9=  {{colors.error.default.hex}}
-palette = 10= {{colors.primary.default.hex}}
-palette = 11= {{colors.secondary.default.hex}}
-palette = 12= {{colors.tertiary.default.hex}}
-palette = 13= {{colors.primary_fixed_dim.default.hex}}
-palette = 14= {{colors.secondary_fixed_dim.default.hex}}
-palette = 15= {{colors.on_surface.default.hex}}
+palette = 0={{colors.surface_variant.default.hex}}
+palette = 1={{colors.error.default.hex}}
+palette = 2={{colors.primary.default.hex}}
+palette = 3={{colors.secondary.default.hex}}
+palette = 4={{colors.tertiary.default.hex}}
+palette = 5={{colors.primary_fixed_dim.default.hex}}
+palette = 6={{colors.secondary_fixed_dim.default.hex}}
+palette = 7={{colors.on_surface.default.hex}}
+palette = 8={{colors.on_surface_variant.default.hex}}
+palette = 9={{colors.error.default.hex}}
+palette = 10={{colors.primary.default.hex}}
+palette = 11={{colors.secondary.default.hex}}
+palette = 12={{colors.tertiary.default.hex}}
+palette = 13={{colors.primary_fixed_dim.default.hex}}
+palette = 14={{colors.secondary_fixed_dim.default.hex}}
+palette = 15={{colors.on_surface.default.hex}}
 background = {{colors.surface.default.hex}}
 foreground = {{colors.on_surface.default.hex}}
 cursor-color = {{colors.on_surface.default.hex}}
 cursor-text = {{colors.surface.default.hex}}
 selection-background = {{colors.tertiary.default.hex}}
-selection-foreground = {{colors.on_tertiary.default.hex}}
+selection-foreground = {{colors.on_tertiary.default.hex}}