fix #526: vm emulator raises "call stack exceeded"… (#529)

fix #526: vm emulator raises "call stack exceeded" when doing println in last row

move check for last screen row from printChar to println, so the check runs on every newline command

Co-authored-by: Dorian Ignee <dorian.ignee@posterselect.de>

simulator/src/vm/os/output.ts

@@ -49,7 +49,7 @@ export class OutputLib {
   }
 
   println() {
-    this.row += 1;
+    this.row = this.row == MAX_HEIGHT ? 0 : this.row + 1;
     this.col = 0;
   }
 
@@ -83,9 +83,6 @@ export class OutputLib {
     this.col += 1;
     if (this.col == MAX_WIDTH) {
       this.println();
-      if (this.row == MAX_HEIGHT) {
-        this.row = 0;
-      }
     }
   }