Fix error in test script

test/regressions.vader

@@ -292,7 +292,7 @@ Execute (#474: Load ftdetect files in filetypedetect augroup):
   call plug#begin('/tmp/plugged')
   Plug 'junegunn/rust.vim', { 'for': 'rust', 'commit': '115d321d383eb96d438466c56cc871fcc1bd0faa' }
   call plug#end()
-  PlugInstall
+  PlugInstall!
   q
 
   tabnew /tmp/any.rs

test/run

@@ -27,7 +27,6 @@ clone_repos() (
   done
   clone https://github.com/vim-scripts/beauty256.git vim-scripts/beauty256 &
   clone https://github.com/junegunn/fzf.git fzf &
-  clone https://github.com/rust-lang/rust.vim.git junegunn/rust.vim &
   clone https://github.com/yous/subsubmodule.git yous/subsubmodule && \
     (cd yous/subsubmodule && git submodule update --init --recursive &) &
   wait