[Parser] Fix parsing of unfinished dot access in string template

Problem appeared in cases like this: "{someVar.}"

#KT-34440 Fixed

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/fir/FirOldFrontendDiagnosticsTestGenerated.java

@@ -328,6 +328,11 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirOldFronte
         runTest("compiler/testData/diagnostics/tests/kt310.kt");
     }
 
+    @TestMetadata("kt34440.kt")
+    public void testKt34440() throws Exception {
+        runTest("compiler/testData/diagnostics/tests/kt34440.kt");
+    }
+
     @TestMetadata("kt34857.kt")
     public void testKt34857() throws Exception {
         runTest("compiler/testData/diagnostics/tests/kt34857.kt");