fix: restore indent level after LESS each() mixin #2380

[Anton-dev3306]

Closes #2380

Problem

After a LESS each() mixin call using object notation (});), the
beautifier zeroed the indent level for all subsequent rules, even when
still inside a parent block.

Root cause: the } handler calls outdent(), then when the next char
is ), trim(true) pops the newline — leaving current_line at the
previous (shallower) indent. The { opening the mixin body (preceded
by ,) skips indent(), so the net result is one extra outdent().

Fix

Added this.indent() / self.indent() after trim(true) in the
peek() === ')' branch to compensate for the asymmetry.

Both JS and Python implementations updated.

Verification

Input:

.my-function(@iterator) { each(@iterator, { color: red; }); .wrong { color: blue; } }

Before fix:

.my-function(@iterator) {
  each(@iterator, {
    color: red;
  });
.wrong {
  color: blue;
}
}

After fix:

.my-function(@iterator) {
  each(@iterator, {
    color: red;
  });
  .wrong {
    color: blue;
  }
}