patch 8.0.0825: not easy to see that a window is a terminal window

Problem:    Not easy to see that a window is a terminal window.
Solution:   Add StatusLineTerm highlighting.
diff --git a/src/syntax.c b/src/syntax.c
index 98c3f51..e026c44 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -6887,6 +6887,10 @@
 	     "StatusLine term=reverse,bold cterm=reverse,bold gui=reverse,bold"),
 	CENT("StatusLineNC term=reverse cterm=reverse",
 	     "StatusLineNC term=reverse cterm=reverse gui=reverse"),
+#ifdef FEAT_TERMINAL
+	CENT("StatusLineTerm term=reverse cterm=reverse ctermFg=DarkGreen",
+	     "StatusLineTerm term=reverse cterm=reverse ctermFg=DarkGreen gui=reverse guifg=DarkGreen"),
+#endif
 	"default link EndOfBuffer NonText",
 #ifdef FEAT_WINDOWS
 	CENT("VertSplit term=reverse cterm=reverse",