patch 8.2.3460: some type casts are not needed

Problem:    Some type casts are not needed.
Solution:   Remove unnecessary type casts. (closes #8934)
diff --git a/src/debugger.c b/src/debugger.c
index ec948eb..e21dd22 100644
--- a/src/debugger.c
+++ b/src/debugger.c
@@ -440,7 +440,7 @@
 	    // replace K_SNR with "<SNR>"
 	    if (debug_breakpoint_name[0] == K_SPECIAL
 		    && debug_breakpoint_name[1] == KS_EXTRA
-		    && debug_breakpoint_name[2] == (int)KE_SNR)
+		    && debug_breakpoint_name[2] == KE_SNR)
 		p = (char_u *)"<SNR>";
 	    else
 		p = (char_u *)"";