v2.6.1: Fix "highest flight today" layout collision on Statistics screen

The v2.6.0 addition was drawn as a single line that could overflow
and collide with the "Reset logbook data" button. It now uses the
same two-line drawStatRow() layout (label + value) as the other
stats, with all row Y positions shifted up slightly to make room,
and the i18n strings dropped their now-redundant ": " suffix since
drawStatRow() renders label and value on separate lines.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/i18n_en.h

@@ -118,7 +118,7 @@ static const char* const I18N_EN[] = {
     "Tap again to confirm!",
     "Logbook data reset.",
     "Uptime: ",
-    "Highest flight today: ",
+    "Highest flight today",
     "History (last 7 days)",
     "No logbook entries yet.",
     "How the history chart works",