Make SonarCloud happier about our code quality (#10630)

src/SlashCommands.tsx

@@ -1427,9 +1427,8 @@ Commands.forEach((cmd) => {
 });
 
 export function parseCommandString(input: string): { cmd?: string; args?: string } {
-    // trim any trailing whitespace, as it can confuse the parser for
-    // IRC-style commands
-    input = input.replace(/\s+$/, "");
+    // trim any trailing whitespace, as it can confuse the parser for IRC-style commands
+    input = input.trimEnd();
     if (input[0] !== "/") return {}; // not a command
 
     const bits = input.match(/^(\S+?)(?:[ \n]+((.|\n)*))?$/);