PHLEGM v9 r73 - Overlay Metric Column Alignment

The FPS and RT numeric values now share the same right-aligned six-character
column. The RT percentage sign is appended after the numeric value; it is
excluded from the numeric alignment. FS and FD label/value fields begin
at the same horizontal column on both overlay lines.

Example (each glyph is 24 pixels wide at the configured 3x scale):
FPS  22.51   FS   0
RT    37.5%  FD  38

Only source overlay spacing changed; no emulation, timing, FS, FD,
throughput measurement, font rendering, or GPU scaling behavior changed.

Validation: node tests/Frame-Deficit-Overlay-r63.Tests.js
            node tests/Overlay-Column-Alignment-r73.Tests.js
Native FreeBASIC build was not run in this environment.
