remove gaps from between tiles

If a screen doesn't evenly divide into columns, the last column will use up the
remaining pixels.

fixes #42

extension.js

@@ -129,13 +129,17 @@ function moveApp(app, loc) {
     var colCount = config.cols === 2 || (config.ultrawideOnly && isNotUltrawide) ? 2 : config.cols;
     if (loc.col >= colCount)
         loc.col = 1;
+
     var colWidth = Math.floor(space.width / colCount);
     var rowHeight = Math.floor(space.height / 2);
 
     let x = loc.col * colWidth + space.x;
     let y = loc.row * rowHeight + space.y;
     let w = loc.width * colWidth;
     let h = loc.height * rowHeight;
+
+    if (loc.col + loc.width === colCount)
+        w += space.width % colCount;
 
     if (!config.useMaximize) {
         unMaximizeIfMaximized(app);