patch 8.2.0732: Vim9: storing value in dict messes up stack

Problem:    Vim9: storing value in dict messes up stack.
Solution:   Correct item count of stack.
diff --git a/src/vim9execute.c b/src/vim9execute.c
index ba4ae478..4356e2a 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -1286,6 +1286,7 @@
 		    }
 		    clear_tv(tv_idx);
 		    clear_tv(tv_list);
+		    ectx.ec_stack.ga_len -= 3;
 		}
 		break;
 
@@ -1319,6 +1320,7 @@
 		    }
 		    clear_tv(tv_key);
 		    clear_tv(tv_dict);
+		    ectx.ec_stack.ga_len -= 3;
 		}
 		break;