patch 8.1.2174: screen not recognized as supporting "sgr" mouse codes

Problem:    Screen not recognized as supporting "sgr" mouse codes.
Solution:   Recognize screen 4.7. (Jordan Christiansen, closes #5042)
diff --git a/src/version.c b/src/version.c
index 73e7e53..e2e213e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2174,
+/**/
     2173,
 /**/
     2172,