[db] remove trailing whitespace from fingerprint

Thanks @iNPUTmice for reporting!

libs/database/src/test/java/org/fdroid/repo/RepoUriGetterTest.kt

@@ -32,6 +32,17 @@ internal class RepoUriGetterTest {
         assertEquals("foobar", uri.fingerprint)
     }
 
+    @Test
+    fun testFingerprintWithTrailingWhitespace() {
+        val uri1 = RepoUriGetter.getUri("https://example.org/repo?fingerprint=foobar ")
+        assertEquals("https://example.org/repo", uri1.uri.toString())
+        assertEquals("foobar", uri1.fingerprint)
+
+        val uri2 = RepoUriGetter.getUri("https://example.org/repo?fingerprint=foobar     ")
+        assertEquals("https://example.org/repo", uri2.uri.toString())
+        assertEquals("foobar", uri2.fingerprint)
+    }
+
     @Test
     fun testHash() {
         val uri = RepoUriGetter.getUri("https://example.org/repo?fingerprint=foobar&test=42#hash")