fix: actually write new buffer to file (gps removal)

src/lib/gps/index.ts

@@ -1,6 +1,6 @@
 // heavily modified from @xoi/gps-metadata-remover to fit the needs of zipline
 
-import { readFileSync } from 'fs';
+import { readFileSync, writeFileSync } from 'fs';
 import {
   PNG_TAG,
   PNG_IEND,
@@ -136,5 +136,9 @@ export function removeGps(input: Buffer | string): boolean {
     removed = stripGpsFromTiff(buffer, tiffIfdOffset, littleEndian);
   }
 
+  if (removed && typeof input === 'string') {
+    writeFileSync(input, buffer);
+  }
+
   return removed;
 }