Update PlayerImpl.ts (#1079)

## Description:
The removeTroops function works with the given parameter value of 1.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>
_bjkim_

src/core/game/PlayerImpl.ts

@@ -698,7 +698,7 @@ export class PlayerImpl implements Player {
     this._troops += toInt(troops);
   }
   removeTroops(troops: number): number {
-    if (troops <= 1) {
+    if (troops <= 0) {
       return 0;
     }
     const toRemove = minInt(this._troops, toInt(troops));