Fix indentation in templates

Use Jinja2 lstrip_blocks option in templates to ensure consistent
indentation in generated files.

roles/matrix-postgres/templates/env-postgres-psql.j2

@@ -1,3 +1,4 @@
+#jinja2: lstrip_blocks: "True"
 PGUSER={{ matrix_postgres_connection_username }}
 PGPASSWORD={{ matrix_postgres_connection_password }}
 PGDATABASE={{ matrix_postgres_db_name }}

roles/matrix-postgres/templates/env-postgres-server.j2

@@ -1,3 +1,4 @@
+#jinja2: lstrip_blocks: "True"
 POSTGRES_USER={{ matrix_postgres_connection_username }}
 POSTGRES_PASSWORD={{ matrix_postgres_connection_password }}
 POSTGRES_DB={{ matrix_postgres_db_name }}

roles/matrix-postgres/templates/systemd/matrix-postgres.service.j2

@@ -1,3 +1,4 @@
+#jinja2: lstrip_blocks: "True"
 [Unit]
 Description=Matrix Postgres server
 After=docker.service

roles/matrix-postgres/templates/usr-local-bin/matrix-make-user-admin.j2

@@ -1,3 +1,4 @@
+#jinja2: lstrip_blocks: "True"
 #!/bin/bash
 
 if [ $# -ne 1 ]; then

roles/matrix-postgres/templates/usr-local-bin/matrix-postgres-cli.j2

@@ -1,3 +1,4 @@
+#jinja2: lstrip_blocks: "True"
 #!/bin/bash
 
 docker run \

roles/matrix-postgres/templates/usr-local-bin/matrix-postgres-update-user-password-hash.j2

@@ -1,3 +1,4 @@
+#jinja2: lstrip_blocks: "True"
 #!/bin/bash
 
 if [ $# -ne 2 ]; then