Simplify arithmetic operation in logical lines checker (#11346)

## Summary

Simplify arithmetic operation in logical lines checker

Author: augustelalande

crates/ruff_linter/src/checkers/logical_lines.rs

@@ -24,7 +24,7 @@ pub(crate) fn expand_indent(line: &str, indent_width: IndentWidth) -> usize {
     let tab_size = indent_width.as_usize();
     for c in line.bytes() {
         match c {
-            b'\t' => indent = (indent / tab_size) * tab_size + tab_size,
+            b'\t' => indent += tab_size,
             b' ' => indent += 1,
             _ => break,
         }