Add missing '!' to shebang line in some bash scripts

tools/build-libs.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 
 #remove previous build
 rm -rf ./out ./build

tools/install-esp-idf.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 
 source ./tools/config.sh
 

tools/update-components.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 
 source ./tools/config.sh