fix(settings): normalize tgCpu on load so a bad value can't block saving (#5091)

The settings page validates the whole AllSetting object before saving, so a
tgCpu value that isn't an integer in 0-100 (left over from an older or corrupt
setting) failed validation with "tgCpu: Invalid input" and blocked saving every
other setting too. Clamp/round tgCpu to a valid integer in the model
constructor, defaulting to 80 when it isn't a finite number.

frontend/src/models/setting.ts

@@ -95,6 +95,8 @@ export class AllSetting {
     if (data != null) {
       ObjectUtil.cloneProps(this, data);
     }
+    const cpu = Math.round(Number(this.tgCpu));
+    this.tgCpu = Number.isFinite(cpu) ? Math.min(100, Math.max(0, cpu)) : 80;
   }
 
   equals(other: AllSetting): boolean {