[processing] Fix import to postgis alg when table name not set (fix #15869, 15097)

Author: nyalldawson

python/plugins/processing/algs/qgis/ImportIntoPostGIS.py

@@ -105,7 +105,7 @@ def processAlgorithm(self, progress):
             table.strip()
         if not table or table == '':
             table = layer.name()
-            table = "_".join(table.split(".")[:-1])
+            table = table.replace('.', '_')
         table = table.replace(' ', '').lower()[0:62]
         providerName = 'postgres'