patch 8.2.1442: outdated references to the Mac Carbon GUI

Problem:    Outdated references to the Mac Carbon GUI.
Solution:   Remove or update references. (Yee Cheng Chin, closes #6703)
diff --git a/src/testdir/test_iminsert.vim b/src/testdir/test_iminsert.vim
index 92af227..d0991c3 100644
--- a/src/testdir/test_iminsert.vim
+++ b/src/testdir/test_iminsert.vim
@@ -37,7 +37,7 @@
 func Test_getimstatus()
   if has('win32')
     CheckFeature multi_byte_ime
-  elseif !has('gui_mac')
+  else
     CheckFeature xim
   endif
   if has('win32') && has('gui_running')
@@ -87,7 +87,7 @@
   CheckGui
   if has('win32')
     CheckFeature multi_byte_ime
-  elseif !has('gui_mac')
+  else
     CheckFeature xim
   endif
   if has('gui_running') && !has('win32')