patch 8.2.1568: prop_find() skips properties in the same line

Problem:    prop_find() skips properties in the same line if "skipstart" is
            used.
Solution:   Use "continue" instead of "break". (closes #6840)
diff --git a/src/textprop.c b/src/textprop.c
index 0645e1f..9dff6b8 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -718,7 +718,7 @@
 		    // on a prop and we're not skipping.
 		    if (start_pos_has_prop && !skipstart)
 			dir = -1;
-		    break;
+		    continue;
 		}
 
 		// If skipstart is true, skip the prop at start pos (even if
@@ -726,7 +726,7 @@
 		if (start_pos_has_prop && skipstart && !seen_end)
 		{
 		    start_pos_has_prop = 0;
-		    break;
+		    continue;
 		}
 
 		prop_fill_dict(rettv->vval.v_dict, &prop, buf);