Renames folder for tgchat CSS styles (#73907)

## About The Pull Request

I think it was previously named "goon" in relation to "goonchat", but
that was phased out three years ago, so it's just confusing to have a
"goon" folder especially when historically those tend to refer to
specialized folders meant for containing content under a non aGPL
license

However, everything in this folder appears to just be styles ported from
goonchat when tgchat was created, which is fine, but it's just confusing
since none of the stuff is licensed under anything from goon- just an
odd name to my eyes.
## Why It's Good For The Game

It's a much more fitting name as to what these files specifically
pertain too, rather than be an arcane reference to a system that has not
been used in quite a while...
## Changelog
nothing that concerns players

.github/CODEOWNERS

@@ -105,8 +105,8 @@
 
 /tgui/packages/tgui/interfaces/
 /tgui/packages/tgui/styles/interfaces/
-/tgui/packages/tgui-panel/styles/goon/chat-dark.scss
-/tgui/packages/tgui-panel/styles/goon/chat-light.scss
+/tgui/packages/tgui-panel/styles/tgchat/chat-dark.scss
+/tgui/packages/tgui-panel/styles/tgchat/chat-light.scss
 
 # SuperNovaa41
 

interface/stylesheet.dm

@@ -2,7 +2,7 @@
 /// !!!!!!!!!!HEY LISTEN!!!!!!!!!!!!!!!!!!!!!!!!
 /// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
-// If you modify this file you ALSO need to modify tgui/packages/tgui-panel/styles/goon/chat-light.scss and chat-dark.scss
+// If you modify this file you ALSO need to modify tgui/packages/tgui-panel/styles/tgchat/chat-light.scss and chat-dark.scss
 // BUT you have to use PX font sizes with are on a x8 scale of these font sizes
 // Sample font-size: DM: 8 CSS: 64px
 

tgui/packages/tgui-panel/styles/main.scss

@@ -56,5 +56,5 @@
 // @include meta.load-css('~tgui/styles/layouts/TitleBar.scss');
 @include meta.load-css('~tgui/styles/layouts/Window.scss');
 
-// Goonchat styles
-@include meta.load-css('./goon/chat-dark.scss');
+// tgchat styles
+@include meta.load-css('./tgchat/chat-dark.scss');

tgui/packages/tgui-panel/styles/themes/light.scss

@@ -82,6 +82,6 @@
     )
   );
 
-  // Goonchat styles
-  @include meta.load-css('../goon/chat-light.scss');
+  // tgchat styles
+  @include meta.load-css('../tgchat/chat-light.scss');
 }