Deleted outdated canvas.fs

git-svn-id: https://forth-ev.de/repos/bigforth@1903 3b8d8251-53f3-0310-8f3b-fd1cb8370982

canvas.fs

-minos also
-
-canvas ptr canvas-test
-
-: canvas-win
-    screen self window new window with
-	1 1 ^ viewport new viewport with
-	    :[ canvas with clear endwith ]:
-	    $200 0 $200 0 ^ canvas new dup [ also Forth ] bind canvas-test [ toss ]
-	    assign ^
-	endwith
-	^ sliderview new s" Canvas-Test" assign
-	map
-    endwith ;