fspy: fix the build

Issue seems to have been introduced by 6ea33082ac1092db1e870c0fbf8be7108161ad29.

ZHF: #172160

pkgs/applications/misc/fspy/default.nix

···
   inherit pname version src;
 
   extraInstallCommands = ''
-    mv $out/bin/${pname}-v${version} $out/bin/${pname}
+    mv $out/bin/${pname}-${version} $out/bin/${pname}
   '';
 
   meta = with lib; {