rc filetype: add some missing ModeChange hooks for trim-indent

Some languages have a trim-indent command but don't use it (for no
apparent reason). Make them trim trailing spaces when exiting insert
mode, like most other languages support scripts do.

rc/filetype/crystal.kak

@@ -17,6 +17,7 @@ hook global WinSetOption filetype=crystal %{
     add-highlighter window/crystal ref crystal
     evaluate-commands set-option window static_words %opt{crystal_keywords} %opt{crystal_attributes} %opt{crystal_objects}
 
+    hook window ModeChange pop:insert:.* -group crystal-trim-indent crystal-trim-indent
     hook window InsertChar .*   -group crystal-indent crystal-indent-on-char
     hook window InsertChar '\n' -group crystal-indent crystal-indent-on-new-line
     hook window InsertChar '\n' -group crystal-insert crystal-insert-on-new-line

rc/filetype/fish.kak

@@ -14,6 +14,7 @@ hook global BufCreate .*[.](fish) %{
 hook global WinSetOption filetype=fish %{
     require-module fish
 
+    hook window ModeChange pop:insert:.* -group fish-trim-indent fish-trim-indent
     hook window InsertChar .* -group fish-indent fish-indent-on-char
     hook window InsertChar \n -group fish-insert fish-insert-on-new-line
     hook window InsertChar \n -group fish-indent fish-indent-on-new-line

rc/filetype/gas.kak

@@ -7,6 +7,7 @@ hook global BufCreate .*\.(s|S|asm)$ %{
 hook global WinSetOption filetype=gas %{
     require-module gas
 
+    hook window ModeChange pop:insert:.* -group gas-trim-indent gas-trim-indent
     hook window InsertChar \n -group gas-indent gas-indent-on-new-line
     hook -once -always window WinSetOption filetype=.* %{ remove-hooks window gas-.+ }
 }

rc/filetype/ruby.kak

@@ -16,6 +16,7 @@ hook global WinSetOption filetype=ruby %{
 
     set-option window static_words %opt{ruby_static_words}
 
+    hook window ModeChange pop:insert:.* -group ruby-trim-indent ruby-trim-indent
     hook window InsertChar .* -group ruby-indent ruby-indent-on-char
     hook window InsertChar \n -group ruby-indent ruby-indent-on-new-line
     hook window InsertChar \n -group ruby-insert ruby-insert-on-new-line