patch 8.2.4876: MS-Windows: Shift-BS results in strange char in powershell

Problem:    MS-Windows: Shift-BS results in strange character in powershell.
Solution:   Add K_S_BS. (Christian Brabandt, closes #10283, closes #10279)
diff --git a/src/term.c b/src/term.c
index bf5943d..827772f 100644
--- a/src/term.c
+++ b/src/term.c
@@ -688,6 +688,7 @@
     {K_K8,		"\316\372"},
     {K_K9,		"\316\376"},
     {K_BS,		"\316x"},
+    {K_S_BS,            "\316y"},
 # endif
 
 # if defined(VMS) || defined(ALL_BUILTIN_TCAPS)