Prevent GLES2 bool uniforms from having a precision type set.

When setting the default precision type for uniforms (before compiling
the shader) prevent boolean uniforms from having one set. Booleans can't
have a precision type and on some Android devices this caused a
compilation failure.

Fixes #30317

drivers/gles2/shader_compiler_gles2.cpp

@@ -318,7 +318,7 @@ String ShaderCompilerGLES2::_dump_node_code(SL::Node *p_node, int p_level, Gener
 
 				// use highp if no precision is specified to prevent different default values in fragment and vertex shader
 				SL::DataPrecision precision = E->get().precision;
-				if (precision == SL::PRECISION_DEFAULT) {
+				if (precision == SL::PRECISION_DEFAULT && E->get().type != SL::TYPE_BOOL) {
 					precision = SL::PRECISION_HIGHP;
 				}