patch 8.1.2086: missing a few changes for the renamed files

Problem:    Missing a few changes for the renamed files.
Solution:   Rename in a few more places. (Ken Takata)
diff --git a/src/GvimExt/GvimExt.reg b/src/GvimExt/GvimExt.reg
index 2b8ebf0..17d085a 100644
--- a/src/GvimExt/GvimExt.reg
+++ b/src/GvimExt/GvimExt.reg
@@ -17,4 +17,4 @@
 
 [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Vim 8.1]
    "DisplayName"="Vim 8.1: Edit with Vim popup menu entry"
-   "UninstallString"="uninstal.exe"
+   "UninstallString"="uninstall.exe"